Transportation Engineering -II
Dr. Rajat Rastogi
Department of Civil Engineering
Indian Institute of Technology - Roorkee
Lecture

-2

Gauges and Permanent Way

Dear students,I welcomeyou all to the lectureserieson coursematerial of transportation
engineeringtwo. In the previouslecture we have discussedabout the history of Indian
railways and we also seen the administrativeset up of the Indian railways. In todays
lecturewe will be giving the focus on the different types of the gauges,their associative
featuresand the permanentway.
(Refer Slide Time: 00:52)

In this lecture,we will be discussinggauges,the gaugeclassication on Indian railways,
the problemsof multi gaugesystem,the uni gaugepolicy of Indian railways, the specific
gauges and the permanent way. Now, we will be starting with the gauges and its
classication adoptedon Indian railways. The gaugesas we see in this diagram. This
diagram showsus a rail where in the head of the rail and the foot of the rail has been
shownand the two rails have beenplacedparallel to eachother.The tail distancebetween
the head of thesetwo rails is dened as gauge.Therefore,denition of the gaugewill beit is the clear distancebetween the two parallel rails laid in any track. So, with this
denition we will try to look at what are the different distancesor the clear dimensions
which have been providedbetweenthe two rail sectionsof the headsof the rail sections
by which we can classifythe variousgauges.

(Refer Slide Time: 01:54)

When we look at this classication, what we found is that they are different gaugeswhich
are available throughout the world. We have gauges like standard gauges. In the case of
the standard gauges, the clear distance between the two rail sections is 1435 mm and
these standard gauges are available throughout the world in on an average about 62
percent of the countries of the gauges which have been provided in the world, they are
the standard gauges.
Another category is broad gauge. In the case of the broad gauge, the clear dimensions are
1676 mm or it is 1524 mm. On an average throughout the world the share of broad gauge
is 15 percent. When we look at some of the countries in which the standard gauges have
been provided, we found that they have been provided in United Kingdom, United States
of America, Canada, Turkey and China. These are the major countries in which the
standard gauges have been provided, though, there are some other countries too where
these gaugeshave been provided. In the case of broad gauge, it is been provided mostly
in the Indian sub continent or some other developing countries like India , Pakistan, Sri
Lanka, Brazil, Argentina and Russia, again are the major countries in which the broad
gauge has been provided.

(Refer Slide Time: 03: 38)

Other than the standard gauge and the broad gauge, there is another category which is
known as Cape gauge where the dimensions or the clear distance between the rails
sections is 1067 mm and it constitutes around 8 percent of the total gauges which have
been provided throughout the world. Other than the cape gauge there is a meter gauge
where

the clear

distance

between

the rail

sections

remains

as 1000

mm

and

in this

case

the share of meter gauge throughout the world, worldwide is 9 percent. We can seeit is a
very similar to somewhere around 8 percent of the cape gauge. Other than these four
meter gauges which have been provided throughout the world there are twenty three
other gaugeswhich have been used in different countries of the world.
Again, looking at different countries in which these gaugeshave been provided we found
that the cape gauge has been provided in Africa, Japan, Australia, and New Zealand. The
meter gauge; again in India, France, Argentina, Switzerland and then the number of other
countries in which the other gauges have been provided. So, these are different gauges
which are provided through different countries and what we found is that out of all these
gauges, some of the gaugeshave been provided in our country, that is, in India.

(Refer Slide Time: 04:59)

Ether

zcsauntrisi

So, we will try to look at the gauges which have been provided in India. In India, we
have provided broad gauge. The broad gauges have been provided on 63 percent of the
route kilometers and dimensions which have been taken between the rail sections, they
are 1676 m. Normal clear dimensions which is being adopted in some of the countries
like 1524 mm is not being adopted in India. Then another gauge which is used in India is
meter gauge. In the case of the meter gauge, the distance between the two rail sections or
clear distance is 1000 mm and this has been provided in 31 percent of the route
kilometers provided throughout the railway network in India. Then there is another gauge
which is termed as narrow gauge. There is a specic gauge which is provided in very
specific area in our country and the clear dimensions in this case, they remain as 762 mm
or 610 mm and it constitutes around 6 percent of the route kilometers.

(Refer
Slide
Time:
6:20)
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These narrow gauges as they found, as they have been provided in mostly the hilly areas
where the terrain are such that we cannot go for the bigger gaugeslike meter gauges or
broad gauges. Now the question comes, how we are going to select the gauge? Whether
we should provide the broad gauge in any area or we should provide a meter gauge or we
should go for a narrow gauge or a hill gauge, that is, 610 mm gauge.
The second factors which needs to be considered, the first factor which needs to be

considered is the cost of construction. Of course, whatever decisions we take the very
first factor which comes into consideration is the cost. The cost of the gauge or the
provision of the gauge needs to be checked in terms of different components. It is to be
checked in terms of the total amount of the area which is to be acquired, it distribute
thousand times of the different other components of the construction or it is to be termed
in terms of the earth work involved in constructing a broad gauge or a meter gauge or a
narrow

gauge.

Similarly, there is another factor is some specific features which needs to be provided on
any track. One such feature like this is bridges. So we have to look at the cost of the
construction of bridges also. Then there is a cost associated with the buildings, the cost
associated with the plat forms or the physical features which needs to be provided at a
terminal building or a junction building or any intermediate station. There is a cost which
is involved in the controlling features like signals. Then there is a cost associatedwith the
rolling stock, that is, the things which are moving on the track.
(Refer Slide Time: 8:10)

MSmlezritixi.

.

.

So, when we are looking at different cost of constructions, what we found is that all the
components which we have just discussed now, they are not having the similar effect. If
we are moving from say narrow gauge to meter gauge or we are moving from meter
gauge to broad gauge construction, then what we found is that if we are taking a
component like land or earthwork then there is going to be a proportional increase in the

cost of construction, as we shift from the lower gauge to the higher gauge. Whereas if we
are talking about the bridges, all the similar type of structures then there is a marginal
increase in the cost, it is not proportional. In the case of the buildings of the signals
because these are the, as these are the features which needs to be provided whatever
gauge we are using, therefore, there is no effect of cost of building or signals in terms of
the provision of a narrow gauge or a meter gauge or a broad gauge or changing from
narrow gauge to meter gauge or changing from meter gauge to broad gauge. In the case
of a rolling stock mostly we have to take at independently of the cost of the construction
becausethere are specic features and specication which are associated with the meter
gauge or the narrow gauge or the broad gauge and therefore that cannot be considered in
this component.
Similarly, there is another factor which needs to be considered when we have to discuss
about the provision of the gauge, that is, the physical features of the country. It is another
important feature becausewe have to look at the capacity; we have to look at the different
specications which are associated with the constructions of that gauge. If you are
looking at the broad gauge where the wider section has been provided or if you looking
at the narrow gauge where a very narrow section has been provided with respect to the
broad gauge . Then the total amount of specications or the type of its specication they
also remain in the same context. In that senseif we look at some of the specific features,
physical features of the country like gradients, then we have to look at that whether it is
feasible to provide a broad gauge or it is feasible to provide a narrow gauge so as to
traverse arc gradient which is provided in any hilly mountainous area. Probably that is the
reason that we have provided narrow gauges or heavy gauges in very specific locations
like Ooty, Darjeeling etcetera.
There is another specific feature or physical feature, that is, curves. When rolling stock is
moving on any of the track of any specification may be broad gauge, meter gauge or
narrow gauge. Then we have to look at the easeat which the movement can be made and
this movement is going to be controlled by the total amount of resistances or the total
amount of forces which are acting on that track or the rolling stock. Looking at that
aspect, there is again some limitations with respect to the curves. So it means we have to
look at the gradients, the curves or similarly some other physical features of the country
and then on the basis of that we should decide whether we can go for the construction of
a broad gauge or a meter gauge or a narrow gauge. What we found is that if we are
having a steep gradients or there are very extensive curves, narrow curves have been
provided then it is better to go for narrow gauge, in the state of the broad gauge or the
meter gauge, but if the gradients are quite feasible or the curves are having a large radius,
that is, they are much of atter curves in that sense we can go for broad gauge
constructions. This is a example which has been given here, this hill railway like from
Kalka to Shimla as you must have seen,you must have heard about or probably some of
you have also gone through that experience of moving from Kalka to Shimla by a train
and that is a hill railways.

(Refer Slide Time: 12:21)

1: w

Similarly, there is another railway which is being provided in the Darjeeling area. You
have to go from Siliguri to Darjeeling and that is another scenic beauty area where we
have the heritage rural section still walking or the locomotive still working. Then, a third
area here it is the Ooty area. So all these are specic area where the hill gauge or the
narrow gauge has been provided with some further specic features, probably we will be
discussing when we taking of the alignments of the rail sections. Then, the next factor
which is there, which controls the selection of the gauge is trafc. What is the total
amount of traffic which is going to traverse, which is going to use that facility? What is
the nature

of that traffic?

We have to look at all these aspects. Horizontal we look on all these aspects we cannot
decide whether we can go for a broad gauge construction or a meter gauge construction.
If there is no traffic at all or there is very small trafc available, then if we are incurring
cost equivalent to the broad gauge construction that is going to be something like a
useless thing or it will be extra expenditure which is being incurred in the provision of
that facility. So, that is why there is a judicious requirement of thinking about what type
of gauge can be provided with respect to the traffic which will be there or which will be
going to use that facility. Now in this caseif we found that there is a very heavy trafc, a
large number of steps are going to be made by the railways, then we can go for a wider
gauge that is the broad gauge. similarly, the another condition is that is there is a high
volume, large amount of traffic is going to be there , large number of persons are going
to use the facility or there are chancesthat commodities are going to be varied through
the railway system , that is, the freight transportation has the potential in that area. In that
case we again can go for the broad gauge constructions but if the volumes are low, then
we can go for smaller gaugestoo.
Another aspect is the speed,in the case of the broad gauge as the size and diameter of the
wheel increases, in that case what happens is that the total circumstantial area distance
which can be moved by that will also increasesand therefore the speedof the vehicle will

increase, in the case of a higher gauge. That is why if they are interested in achieving
higher speeds we can go for broad gauges instead of the narrow gauges or the meter
gauges.In this case, again the traction or signaling they are independent things; signaling
is one is that which controls or provides the safety on the track, whatever are the speeds,
is not going to be controlled by the speed. It is going to dene the things in terms of the
movements going on any of the track so as to reduce the chancesof any accidents taking
place becauseof the unidirectional trafc or the bi directional trafc.
Similarly, it is the case in traction; traction means the total amount of practical effort
which is available with any locomotive which needs to be provided on the basis of the
traffic.
If there is a higher traffic, obviously we are going for the broad gauge
construction and then for those broad gauge constructions we have specific locomotives
which can be used. Similarly, if we are talking about the meter gauge construction then
again we have the specific locomotives which can be used for the meter gauge
construction. Therefore, the things are quite independent as far as the traffic is concerned.
Now another aspect is that if you are going for a wider gauge, it means we can haul large
amount of persons or we can haul a large amount of freight between the horizons of the
destination.

(Refer Slide Time: 16:32)

-2: -~

In that sense,the total operating cost per tonne kilometer will reduce. So there is another
operational advantage which will be there in case we shift from a lower gauge to a higher
gauge. So in this sense,there are so many factors which are interlinked with each other
and therefore we have to take all of these together into consideration and then only we
can decide that what type of gauge can be provided, it is not a single factor decision
which

can be taken

as such.

Now, on the basis of all these, a certain classication which has been adopted in variables
regarding all the types of the tracks of the gauges which can be provided. In the case of
the broad gauge track classication, we have different groups like A, B, C, D and E and

for these groups we are selecting features specifications which needsto be complied with.
Now, these further slides, we will be looking at these groups of the broad gauge class
classication and the specic features related to them. Here in this slide, we are taking
the specication related to group A and group B of the broad gauge track classication.
In this case of the broad gauge track classification by this one the speedsare controlled
up to 160 kilometers per hour, in the case of A category of broad gauge, whereas in the
case of B category of broad gauge, the speedsare controlled, limited up to 130 kilometers
per hour. Another aspect is the type of the rail section which can be used; this type of the
rail section is defined in terms of the kg weight per meter length of the rail section. That
is the one specific unit which is been adopted in Indian railways or in other railways too
depending on the unit in which they are working. So we have to look at this aspectsand
this

is dened

in terms

of the total

amount

of traffic

which

can be hauled.

In this

case the

classication of this total amount of the trafc is being done in three categories. We have
the traffic in less than 10 GMT, and then another category from 10 to 20 GMT and the
third category is greater than 20 GMT. For all these categories the section of the rail has
been dened in terms of the weight per meter rail length.

(Refer
Slide
Time:
19:01)
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And that is been taken as 60 kg per meter in the case of traffic load which is more than
20 GMT , for both the cases of category A and category B of the broad gauge track
classication, there it is being taken as 52 kg per meter rail section length in terms of the
two other categories of the traffic that is 10 to 20 GMT and less than 10 GMT, in both
the casesof category A and category B broad gauge track classication.
Further, in the case of another two categories, that is, category C and category D of the
broad gauge track classication, what we look is that the speeds are being restricted in
the case of category C to sub urban railway conditions. These sub urban railway

provided in Bombay or the metro trains being provided in Kolkata or Delhi or another
railway which is being provided in Madras or Chennai.
In the case of the D category of the broad gauge track classication, the speeds are
restricted to 100 kilometers per hour. The type of the rail section again in kg per meter
section weight, it is being dened for the rest of the three categories that is greater than
20 GMT,

10 to 20 GMT and less than 10 GMT.

In this case too, what we found is that

the rail section is being used as 60 kg per meter rail section for the traffic load of greater
than 20 GMT in both the casesof C and D category of broad gauge track classication.
Where as in the rest of the two categories, that is, from 10 to 20 GMT and less than 10
GMT or both the categories of C and D broad gauge track classication conditions, the
type of the rail section used is 52 kg per meter length.
(Refer Slide Time: 21 :03)

Again, coming back to the A and B category, we look at some other specific
specications which are associated with these tracks. They are sleeper density; sleeper
density is a term where it is defined as a total number of sleepers which needs to be
provided per kilometer length of the rail section or the track. So, if we have laid one
kilometer length of the track or the rails then how many sleeperswe are going to provide
below the rail , that is ,what I termed as sleeper density and this sleeper density in the
case of category A broad gauge track classication is 1660 sleepers. It means 1660
sleepersneed to be provided in one kilometer rail length in the case of the A category of
the broad gauge track classication whereas in the B category of broad gauge track
classication, we have either or two conditions, that is, we can go for 1660 sleeper
density or we can go for 1540 number of sleepersper kilometer length of the track.
Another aspect is the ballast cushion; ballast cushion is defined in terms of the total depth
of the ballast which is provided below the sleepers, so this ballast which is provided
below the sleepers is 300 m depth in case of A category of broad gauge track

classication whereas in the case of B category of broad gauge track classication it is
either

300 mm

or 250 mm.

(Refer Slide Time: 22:42)

Again coming to C and D category of the broad gauge classications, we are looking
back on the same aspectsof the specification which we have seen for A and B categories
just in the previous slide. Here, what we found is that in the case of the C category which
is related to the sub urban railways or in the case of the D category, we have the similar
conditions of the sleeper density in terms of the total number of the sleepersper kilometer
track length, that is, 1660 or 1540 sleepers per kilometer length. In case of the ballast
cushion, the values are again in the case of C is 300 mm and in the case of D category it
is 300 mm

or 250 mm.

(Refer Slide Time 23:43)

Now, coming to the last group in the broad gauge track classification category, that is,
group E. They found that the speedsare less than 100 kilometer per hour. The rail section
in kg per meter in the terms of perfect which is greater than 20 GMT, they are generally
not the caseswhere the traffic is going to be more than 20 GMT in the case of E category
of broad gauge track classifications. In the category of time to 20 GMT, we are using 52
kg per meter rail section, that is, the length for per meter length of the section, the weight
of the rail section id 52 kg and then in the case of less than 10 GMT, the rail section
which we are using is another specific rail section which is defined as 52 SS section. The
sleeper density again in terms of numbers per kilometer rail length is 1540 to 1310. These
are the two values which can be used in the case of the category E or the broad gauge
track classication and the ballast cushion ranges from 300 mm to 200 mm.
(Refer Slide Time:

24:45)

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smhi-amWEm;m:j)= Emiié

In that sense,what we found is that we are having certain ranges for the speed of the rail
section for the sleeper densities and for the ballast cushion. The speed is changing from
somewhere around from 100 kilometer per hour to 160 kilometers per hour, the rail
sections are varying from 52 SS to 52 to 60 kg per meter. The sleeper density is varying
from 1310 to 1540 to 1640 and ballast cushion is varying from 200 to 250 to 300 mm. So,
this is how the specifications of the broad gauge track are varying for the five categories
which we have seenjust now.
Now, further things are that the rails which are to be used for group A to group D they
should to ninety UTS rails. Ninety UTS rails means, this is, UTS is ultimate tensile
strength and the units are kg per mm square. So it means the rail sections which were
using for the categories group A to category group D, they should have ultimate tensile
strength of 90 kg per mm square, that is how they are being defined. There is another
category of rail section which is being used in Indian railways, that is, 72 UTS railway
section. Then the sleepers,they should be general F concrete or there is another category
of rail sleeper which is CST nine sleepers. So, we will be looking at these types of the
sleepers; the concrete sleepers or the CST nine sleepers when the sleepers will be taken
up through the lecture series of transportation engineering two.
(Refer Slide Time: 26:28)

Now, here we are going to look at certain tracks which have been defined under the
different groups of broad gauge, that is, group A B C D and E. In the case of group A,
there are 5 sections which have been defined under this category. The one section is New
Delhi Howrah, another section is New Delhi to Mumbai central, then another section is
the New Delhi to Madras central , then Howrah to Mumbai V T and the new section

which was added sometime back was Ratnagiri to Sawantwadi that is on Konkan
railways ,that is why it is termed as KR here.

(Refer Slide Time: 27:09)

Then in the case of group B we have 25 such rail sections. They are Allahabad to
Bhusaval via Jabalpur, Kalyan to Kazipet via Daund Wadi in Pune, Vadodara to
Ahmadabad, Mathura to Ratlam, Sitarampur to Mughalsarai via Patna, Howrah to
Barddhaman via Bendel, Kharagpur to Vijayawada via Waltair, Kiul to Barharwa via
Sahibganj.
(Refer Slide Time: 27:30)

(Refer Slide Time: 27:47)

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~

Delhi to Kalka via Ambala Cantt., Ambala Cantt. to Pathankot via Ludhiana, Ambala

Cantt. to Mughalsarai via Moradabad, Lucknow and Pratapgarh.
(Refer Slide Time:

28:01)

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Then there is another section from Agra Cantt. to Lalitpur, Lucknow to Kanpur, Virar to
Godhara, Lalitpur to Bina, Khanna to Malda town via Farakka. Wadi to Madras central
via Raichur, Jolarpettai to Bangalore, Arakkonam to Ernakulum via Erode, Coimbatore,
New Jalpaiguri to Malda town that is not frontier railway.

(Refer Slide Time: 28:17)

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(Refer Slide Time: 28:37)

Chennai beach to Dindigul, Chennai beach to Chennai Egmore, Bangalore to Gooty,
Ghaziabad to Saharanpur.

(Refer Slide Time: 28:49)

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Some more are like Ahmadabad to Delhi via Bandikui, Kanpur to Agra.

(Refer
Slide
Time
28:56)
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Agra

So these are the broad gauge track classications which are there. In the case of the
group C, we have not gone for the group C conditions because they are the sub urban
railways as I have just discussed in the previous slides that they belong to the local
trains which are sub urban railways or local trains moving in Mumbai , Kolkata, Delhi
Madras and likewise. Now we come to the group D. In the case of the group D there are
38 rail sections which have been classied into this category. Similarly, in group E there
are more than 38 rail sections which have been categorized in this one. I am not going
into

the details

of these

rail

sections

now

because

of the lack

of time.

(Refer Slide Time:

29:39)

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Now we move to the meter gauge track classification. In the case of meter gauge track
classication, we have three categories of track classications; the rst classication
category is the Q routes where the speedsare more than 75 kilometers per hour and the
trafc density is dened in terms of more than 2.5 GMT, and in this case some of the
examples are the Rewari -Ringus- Phulera, Ratangarh to Degana, Delhi Sarai Rohilla to
Ratangarh, Ajmer to Khandwa.

(Refer
Slide
Time:
30:18)
Q-mutas

ii: wand
fs.

imer

-

Then Jaipur to Ajmer, Ahmadabad to Bhavnagar, Agra to Lalkuan via Bhojipura
Mathura, Bhojipura to Lucknow junction.

(Refer Slide Time: 30:30)

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Villupuram to Thiruchirapalli via Thanjavur, Chennai beach to Villupuram, Dindigul to
Madurai, Jodhpur to Agra east bank via Jaipur, Kathgodam to Bhojipur, Bangalore to
Miraj.
(Refer Slide Time: 30:50)

All the category in the case of meter gauge track classification is R- routes. In this case,
the tracks have the potential of moving the train at a speed of 75 kilometers per hour but
they are not moving the trains at this speed, but if required that can be done. In the case
of the traffic density it is a little lower than the previous category that is the Q routes
here. It is 1.5 GMT or more. In this case, we have again some categories like R 1 route,
where it is dened as greater than 5 GMT per year and these are the some of the routes

which are there like Hospet to Hubli, Secunderabad to Guntakal, Londa to Marmagoa,
Katihar to New Bangaigaon, Guwahati to Tinsukia, Gandhidham to Palanpur or so on.
(Refer Slide Time: 31:45)

Coming to the next category under R routes is the R 2 routes, where the trafc density
intensity have been dened in terms of 2.5 to 5 GMT per year. Some examples of the
routes here are Guntakal to Hospet, Guntakal to Villupuram Ttiruchirapalli to
Manamadurai, Virudhunagar, Purna, Secunderabad,Jodhpur and Marwar.
(Refer Slide Time 32:11)

Now we look upon another meter gauge track classification. Here, again in the case of
route R category we have the third category: R three routes, where the traffic intensity is
being dened in terms of 1.5 to 2.5 GMT per year and in this case again there are certain

examples which have been given for the tracks; the Madurai Rameswaram section,
Virudhunager Tenkasi section, Dindigul Pollachi, Ratangarh Bikaner Merta road,
Muzaffarpur Narkatiyaganj and Birur Shimoga town.
(Refer Slide Time: 32:50)

There are some of the sections of the railways or rail tracks which fall under the R three
route categories. Then there is another category which is termed as S class where all the
remaining meter gauge lines which are rated for below 75 kilometer per hour and or with
low traffic densities, that is, generally below 1.5 GMT per year, they fall under this
category. So they all are meter gauge track classification.
(Refer Slide Time 33:18)

Now coming to the Indian railways track specications, some of the basis of whatever
track we have seen so far, the very first is specication is permissible degree of
curvature, that is, the amount of the angle which is being fall on the centre of the curve
by a specied length of the curve. In the case of the broad gauge, this is dened as 10
degree, that is the maximum value of the degree of curvature which can be provided on
any broad gauge track. In the case of the meter gauge it is 16 degrees and in the case of
the narrow gauge it is 40 degrees. So, these are permissible values which need to be
provided for the Indian railway tracks.
In the case of the ballast cushion as we have seen previously, it varies from 20 to 30
centimeter thickness, that is, 200 to 300 mm thickness as we have written or we have

seenin the previous slides. The sleeper density here it is being defined in another notation
that is M plus 7 to M plus 4. Then it is also being defined here in terms of those similar
notations which we have discussed previously under the categories of broad gauge track
classications moving from category A to category E. In that category categorization, we
have seen that the value of the sleeper density was changing from 1310 per kilometer to
1660 per kilometer with intermediate value of 1540 per kilometer.
(Refer Slide Time:

34:31)

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saver

Here, there is a another way of dening the same thing in terms of affecter or value
defined as M plus 7 to M plus 4 where 7 or 4 are the arbitrary values being taken, so it
can be 4, 5, 6 or 7 and M is defined as the length of the rail section manufactured at any
of the company. So, if there is a 12 meter rail section, it means it will transform to 12 plus
7 means 19 or 12 plus four means 16. So that is the range in which the sleeper density
can be there for that rail section; if there is a heavier load we go for the more of the
sleepersto be provided within the rail sections ,if there is a lesser of the load then we go
towards the lower value. So both are the ways by which we define generally a sleeper
density. Of course, we will be looking at the suspect of the sleeper density when we will
be discussing sleepersin detail in some of the other lectures.

Then another specification related to the Indian railway track is regarding type of the
sleepers which can be provided; they are prestressed concrete sleepers especially for
group A and group B routes , that is the high speed routes as far as the prevailing
conditions are concerned. Those slowly and slowly they will be moving towards the
speedsto as high as 250 to 300 kilometers per hour and they are trying to find out the
feasibility of providing those things or the changesto be made in the track specifications
so that we can accommodate or provide the operational speed of that much range. In the
case of the standard rails, we have to provide in the case of the broad gauge, the rail
sections has 60 kg or 52 kg and we say 60 kg or 52 kg , it means we are talking in terms
of per meter rail length. Then in the case of the meter gauge, there are three categories of
the standard rail sections which are provided. There are different than the rail section
which we have discussed so far. They are 90 R rail sections, 75 R rail section and 60 R
rail section. This 95 R, 75 R and 60 R rail section, they have been borrowed from the
British railway standards.
British were the people who started railways in India and therefore the standards were
also borrowed from them. In this case when we are talking about 90 R means, we are
talking about 90 pound per yard rail length. Similarly, it is for 75 and 60 R rail section.
The length of the rail is either 13 meter in case of the broad gauge or 12 meter in case of
the meter gauge. This is the round off value of the actual length which were
manufactured in different companies, which were manufacturing the rail sections.
Another important thing is the fastening which needs to be provided. Fastening means
those things which are used to connect the different rail sections with each other or the
rail sections with the sleepers.These fastening should be elastic in nature and, that is, as
far as possible, we should use those fastenings where the elasticity is being maintained.
(Refer Slide Time: 37:47)

tin féaaetasaztaéingicav

Then, another specific feature of tracks is turn out. Turnout is a condition where we can
change the direction from one track to another track. Of course, we will be taking out the

turnouts again in details in some of the lectures. Here, we are looking at just the main
specication related to turn out. It is defined in terms of one in N value, where N can be
anything like it is 8 and a half in the case of a movement of goods train. In the case of
passengertrain it varies from 1 to 12 to 1 in 16. As the value keeps on increasing, it
means we are providing more atter curve as compared to the sharper curve.
(Refer Slide Time 38:45)

in u»s::s*$:5
iéna

It means there is an ease of turning and there is a comfort being maintained and because
in the case of the passenger movement, more comfort or ease of safety needs to be
maintained and therefore that is why we have 1 in 12 or 1 in 16 sort of turnouts. Again,
when we are going for high speedsas I told you, they are trying to achieve the speedsto
as high as 250 to 300 kilometers per hour. We will be looking at the turn outs which will
be having the values of something like 1 in 20 or 1 in 24. Again, they are under
considerations and as soon as the things will be nalized we will be moving these
aspects.

Now we come to another aspect of the provision of the tracks of the gauges; tracks are
multi gauge and what is the problem associated with that multi gauge system? As you
have seen in the case of the Indian railways, we are providing broad gauges, we are
providing meter gauges and then we have narrow gaugesup to specications, that is, 760
and 610 mm. Is there any problem of providing so many gauges or shifting from one
gauge to another gauge? We can understand this problem when we keep our self into that
condition. We assume that we have to go from say point A to point B and there is an
intermediate stop at point C where the change from one gauge to another gauge has to be
done. In that if you are traveling yourself in that sense then what all the different
problems you can foresee or you can experience.
Well we will be looking at this problem which can be there. The very rst thing is in
convenience to the passengers;in this case what are the different kinds of inconveniences
which can be there? The one inconvenience is that because the specications are

different, therefore the tracks are provided at different locations for the meter gauge or
for the broad gauge or for the narrow gauge. So if you are coming by a broad gauge train
and you have to take a narrow gauge train or a meter gauge train, it means you have to go
to some other platform , that is, the change of the platform is necessary. So if you take
either thing with you and move towards that side that means either you have to cross the
gauges or climb the gauges.That is another problem of associatedwith the change in the
gauge. So we have to carry out with all the luggages with yourself or you have to look
for some man power who can take all your luggage and you can move to the another
gauge or the platform. So these are all types of inconveniences which will be there to any
of the passengers when this type of change over needs to be made or the transfer needs
to be made. The hauling of luggage, the tension regarding catching the link train, that is
the important aspect.
(Refer Slide Time: 41 :44)

You do not know whether you are moving on a right time or you are going to be late and
therefore if there is a link train for that journey, then if you are going at the right time you
can catch that one otherwise you are going to miss it. So that sort of a tension will always
remain with you and the another big aspectis that if you are reaching that transfer point
that is, the station C as we have taken an example, then if it is at the night time, the
transfer at the night time is another very, very important and considerable thing because
that the safety is associated at that point of the time. So that is another sort of
inconvenience to the passengersto stay awake or somebody has to awaken them and then
only they can go and change over.
Another aspect related to the multi gauges; the transshipment of the goods. Again in this
casethere can be a number of types of problem which may be associatedwith it like there
is damage to goods; you have to take the goods from one point to another point there are
always chancesthat something may get damaged. If you have booked your luggage then
it is to be transferred from one luggagement to other luggagement and during that time
again there are chancesgetting the things damaged. There are chancesof theft also. You

are transferring the things and somehow at some point of the time on a bad day you found
that something is being lost, it is being theft or storage facilities are required in some of
the cases. There is a large shiftment which is going on and that case of the large
shiftment when it is to be transferred there is some other train of another gauge. Then
you have to put that material at some place, you have to store it, so the storage facilities
need to be provided at that transfer point. Delays are caused many of the times. These
are another aspectsassociatedwith it.
(Refer Slide Time: 43:50)

"at
'

in go-Ma

Mishandling is the another specific case related to goods only , that is, instead of going
to place B the things are going to place D becauseof just mishandling case. Then there is
inefficient use of rolling stock. The inefficient use of the rolling stock means that
whatever the total amount, total locomotives which are in use we are not using them to
the complete efciency, complete 100 percent utilization is not there. As we have taken
an example that you are coming up to two point C by the broad gauge and then after that
we are probably going by meter gauge or a narrow gauge. Then in that sense whatever
locomotive or the train or the compartments have come up to two point C on the broad
gauge they will remain as such if they are not going to be moved to some other place. If
they are moving to some other place then it is ok.
Then they are under use and therefore there is no inefciency involved in the use of the
rolling stock but if they have to stay there and they have to wait for another link train
which comes and then they will be taking back the passengertrafc or the goods traffic
and move back, in that sense,it is the inefficient use of the rolling stock. So in that case
what will happen is that if you are interested in not having inefcient use and we think
that we can transfer our train back to the origin point, then in that case it will be moving
empty. That is another sort of inefficient use of the rolling stock because we are not
handling revenue.

Now another case is that we are having the track which is lying idle for long period of
time because we are waiting for the trafc to come from the link line. If this is the case
then this is also termed as the inefcient use of the rolling stock. Then the transferability
of the equipment is not possible becausethere are of the different specifications.
(Refer Slide Time: 45:45)

So because of this difference in the specication we cannot make use of one thing at
some other location. It has to be used where they are. So it means they will keep lying as
such and we are not in the position to use them efficiently.
Another factor associated with the multi gauge problem is the additional facility which
needs to be provided at stations or in the yards. We have to provide the sheds of different
specications , we have to provide the yards of different specications becausedifferent
types of rolling stocks is going to be there at that station , then the maintenance
equipment again they are different from different types of the rolling stocks. So we have
to have all those types of the maintenance equipments. Waiting rooms or areas because
the different platforms are associated, therefore they require waiting room on this
platform as well as on the other platform ,that is, called the platform of the broad gauge
or a platform for the gauge other than the broad gauge. The platforms are also of different
specications becauseof the size differences of the specification differences in the meter
gauge and the broad gauge or the rolling stock specication differences.

(Refer Slide Time: 46:59)

Then there is a factor, that is, hindrance to fast movement of goods and passengertrafc.
You cannot move the things at the faster speeds because it needs to be transferred at
intermediate points. When you are transferring your things at your intermediate points
then

it means

there

will

be some

time

lack

which

will

be associated

with

that

transfer

and

therefore that is a hindrance and it is a big problem especially during emergencies. If
there is a emergency and there is a big shiftment which needs to be transferred or
transported to that location and if in between there is transfer associatedthen that cannot
be done at a faster rate or a speedier rate. The delays associatedwith those transshipment
are on the reason.

(Refer Slide Time: 47:48)

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Tram$¥1.Emeant

Another aspect here is the difficulty in the balanced economic growth. Now this is the
aspect of provision of different type of the gauges in different areas becauseof the total
resources gets distributed and in the total resources of getting distributed it can become
an hindrance to the different types of the development which can take place in any of
the area; like there is a industrial development there is a heavy industry which is to be
placed in any area then it will be requiring a broad gauge but if the heavy industry is not
there probably we can go for another gauge but in that sense there will be a multi
gauge problem, that you cannot transfer the one thing from one point to the another point
and there is efficiency involved with the industrial processesalso. So, it will be lost. The
movement between the points of production and the consumption is another aspect in the
case of the economic conditions. How much time it is going to take to move the things
from the point of production to the place where things are going to be consumed, that is
another important aspect.
(Refer Slide Time: 48:57)

vai: is at

cnvuaaaamaptiun

Now difficulties in the future gauge conversion, this is next aspect that is the problem in
the case of the multi gauge system because if you going to change over from the meter
gauge or the narrow gauge to the broad gauge then again the resources are involved in
that one and when the number resources are involved in that one you have to get all those
resources you have to take out the things, you have to suspendthe movements and that is
the type of the difculty which will be there in that aspect.

(Refer Slide Time: 49:09)

Now we come to the related aspect of this one; that is uni gauge policy. Looking at all
those problems which are being faced by the freight movements or the passenger
movements because of multi gauge system the Indian railways and the government of
India in 1992 decided to provide uniform gauges throughout the countries and therefore
they came out with the uni-gauge policy and in this uni-gauge policy there are certain
advantagesinvolved which are just the reverse of the all those problems which we have
seen previously, like there is no transport bottlenecks. In this case there is no need of
transshipment because we are going from point A to point B in the example, which we
have taken previously without stopping at point C or without changing the things at point
C. No waiting and delays are associatedhere, the elimination of inconveniences because
we are not going to come out at point C with all your luggages and your moving
,handling of luggage is easier becauseit is to be placed once and to be taken out once.

(Refer Slide Time: 50:36)

Mn %r§ee&d
as tran:;s£a¥1;§§mm,ent

¥'il£:waing and delays.
E.Itm'i+nat%aun
of i&mnaw&An§e§u=in::&s

2%ia.r§§i,ir's§
of =liJ%;g%g;a%ga&
is easier

There is no transshipment hazard but the safety is involved with the material, there is a
better safety. There is no damage , no theft, no mishandling of luggage becausenothing is
going to be transferred from one compartment to the other compartment, one wagon to
the other wagon, one platform to the other platform. There is elimination of unsafe night
time

transfers.

(Refer
Slide
Time:
51:03)
Eeg:r~Safety
=.
An.lug

n;t§:«s:ha:icl.tin»gl
ge

raga ft of unsafe ilgiiif.time»

Then there is a another better aspect of uni-gauge policy is that we can think of provision
of alternate routes which was not possible in the pervious conditions because all the
resources was ,that in, consumed in the provision of different type of facilities, different
type of gaugesthroughout the country.

Now we can think of that if there is a wrong route, whether there is a possibility of
providing any alternate route of the same specification, so that, the total load or the traffic
can be diverted between those two points by using the alternate routes or we can develop
any other area and there can be a more of the development in that area; may be a
industrial development or the employment generation likewise. So here we at looking at
the pressure on the existing network will reduce, economic scenario will improve, higher
penetration of products will be there becausewe are reaching different sections which we
should not reach in the previous conditions and there is a more exibility of movements
because we have the rolling stock available to us and we can use that rolling stock
without changeovers and there is a better connectivity, that is, because the alternate
routes are feasible things.
(Refer Slide Time: 52:13)

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imtprusm
Higher pane .ai1a1«n»f}urarmz;wt$
More

in meuveme-mt

There is also improved utilization of the track. There is more efciency associatedhere,
the higher efciency will be there. There is a reduction in the operating expensesbecause
we are not yet stopping at one point. We are achieving the things at higher speeds and
there is the more of the efciency involved, that is why the operation expensesare going
down. There is lesser or no idling situation.

(Refer Slide Time: 52:44)

iA
.
lmip:r:xved*
12.:

2::of track

Highaevr
a.e%§c::ie;rz;s:§r*
é.a~u:.,ae;'t%&m
§:nvnirati:1:g.e:_.gm1rs&s=
Lwserr as my:il%is%Q'
:ara:rtam'tf:x:a:=r:

Better turn around conditions becausethe rolling stock has not to wait at the intermediate
or the transfer point for the link traffic to come. Therefore, in that sensethe things can
just change or take a turn from the next point to the previous point. The higher use of the
equipment will be there in this case, the operational expenses again will reduce, more
operations can be scheduled becausewe are having a better turn over time, no idling of
the years are involved here, higher benets to the users because they are getting the
facilities again and agreeing at a lower time periods. There is an optimization of the
facilities because we are not required to provide the facilities at different locations. So
you can optimize the things, locate them centrally or locate them specically depending
on the situations.

(Refer Slide Time: 53:36)

us?!me

Jtiea

There is better balanced economic growth and in this case we have the regional effects
will reduce becausethere is a better connectivity from one part of the country to another
part of the country and that is how, that is what we have seen in the independence
condition of the India also, where the railways were provided and they provided the
connectivity to all of the different parts of the country. There is a higher growth of areas
otherwise which are being left unconnected. There is another economic aspect of the unigauge policy; more dispersal of activities will be there becausethere is no concentration
of activities in one area. We have the greater connectivity, people start thinking of
starting the different activities in different sections, different areas, so that they can
achieve better economic balance growth.
(Refer Slide Time: 54:29)

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Rgiiéi a~££w;ts

graswt§:ii
:m%2u;ce~

Then the next aspect is then no multiple tracking will be there. In this case the extra
facilities need not to be provided becausethe specifications are same on all the platforms,
on any of the sections or any of the station. Multiple tracks, yards, equipments of
different specifications again are not required and in this case it is going to cut off the
cost which is clear in terms of the multi gauge conditions.

(Refer Slide Time:

54:58)

Better transport infrastructure will come up with the uniform gauge policy, with the
provision of the same gauge throughout the country. Better and efcient movements will
be there, direct connectivity to different areaspreviously served by only the meter gauge,
higher opportunities to massesand of course this is another important aspect as far as the
economic

conditions

are concerned.

(Refer Slide Time: 55:19)

miter !tra;as.pnrtinfrastrunrtnraa

T

Er =n=ppnrtu ties in ma5s.&5,

It will boost the investors confidence, becausethere is no transshipment of materials, the
long distance movement of the freight will be possible and this is what we are seeing
nowadays in the Indian railways where the Indian railways are earning large amount of
revenues because of the booster investors condence by the provision of the long
distance high speedfreight trains or the container trains.

(Refer Slide Time:

55:29)

"
§%¥E$§¥"i$zen:

Now, once we have completed all those aspectsthe two specific aspectsof the gaugeswe
will be looking at two or three next slides, that is, loading gauge and construction gauge.
Now, here in this diagram loading gauge has been shown. This loading gauge shows the
dimensions in terms of there is a one L shape angle condition from which there is a
suspendedarm or arch. This arch is having certain height at the center as well as at the
ends from the rail section which have been provided here at the bottom. So, this is total
amount of height which can be there at any loaded wagon. Similarly, this is going to be
the total width of the section of the wagon which can be filled with any material, that is
mostly it is going to be use in the caseof the freight transportation. This is very important
because we have to look at the different specication which has been provided to the
Indian railways and the wagons have to comply with all those specifications. So therefore
the loading gauge representsthe maximum height and width to which a rolling stock may
be built

or loaded.

(Refer Slide Time: 56:28)

5:i?'a££ilgi.*E!'

(Refer Slide Time: 57:06)

Now we can look at the specications in the case of the broad gauge; the maximum
height is 4140 m where as the width is 3250 mm. In the case of the meter gauge, though
we are of still continuing with the meter gauge that is why we are looking at this aspect,
the height here is 3455 mm and the width is 2745 mm.

(Refer Slide Time: 57:35)

Then, there is a construction gauge. Construction is the gauge which is decided by adding
necessary clearances to the loading gauge so that the vehicle can move safely without
infringement.
(Refer Slide Time: 57:48)

This is the condition which is to be provided in case of all the bridges or the tunnels or
the pavements or the platforms which needs to be constructed or the shapes of all the
platforms becausethere are certain clearances which are added to the loading gauge and
then with those clearancesthis construction gaugesis provided.
Now, today what we have discussed so far is the different types of the gauges and the
specic gauges and the problems associatedwith those gauges and the way out by which

the problems can be nullified. Now in this case what we have seenis that the provision of
uniform gauge policy can bring in the balanced growth in the country, at the same time it
can reduce the inconveniences for the passengersor for the shippers who are going to
haul their freight to from one point to the other point. So, therefore it is going to be a
good condition as far as the Indian railways is concerned. We are going to stop at this
point and in the future lecture we will be looking at the permanent way, the aspects
related to the permanent way, the wheels and the locomotives and the associatedfeatures
with that one, that is, the crowning of wheels. So students we stop at this point. Have a
nice day. Bye.