This compendium of instructions on ‘track structure’ is issued for guidance of officials dealing with the subject matter. It contains all administrative orders issued from Railway Board from time to time, which have relevance on date. The compilation in the compendium is to remain updated and for documentation purposes. However, rules and provisions of the original circular / letter issued from the Board constitute the final authority on the subject and not this compendium. Therefore, this compendium should not be referred to as an authority except for identifying the valid circulars / letters issued by Board.
While all out efforts have been made to make the compendium exhaustive yet, corrections to this compendium may be required and shall be issued serially numbered. In the next edition, mention shall be made of the number of incorporated correction slips. Remaining correction slips shall continue to remain in vogue till the next edition. The compendium covers following subjects:
Zonal Railways may supplement the instructions, however taking care that these do not contravene the provisions of the codes and general rules.
EDCE(Planning)
Railway Board
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Compendium of instructions for Track Structure
(B.G.)
The track structure for Broad Gauge routes have been categorised into three groups namely,
- Main lines;
- Loop lines;
- Private sidings
(i) Track structure for
main lines
The track structure for main line routes is as indicated in the following table:-
- Rails
|
GMT |
A |
B |
C |
‘D Spl.’ |
D |
‘E Spl.’ |
E |
|
>20 |
60 Kg 1 |
60 Kg 1 |
60 Kg 1 |
60 Kg 9 |
60 Kg 1 |
60 Kg 9 |
60 Kg 1.2 |
|
10-20 |
52/90 6 |
52/90 1.6 |
52/90 6 |
52/90 9 |
52/90 1.5 |
60 Kg 9 |
52/72* 1.2 |
|
5-10 |
52/90 2.6 |
52/72* 1 |
52/72 1 |
60 9 |
52/72* 1 |
60 9 |
52/72* 1.2 |
|
<5 |
52/90 1.6 |
52/72* 1 |
52/72 1 |
60 9 |
52/72* 1 |
60 9 |
52/72* release 1.2 |
(Suffix shows reference to Rly Bd’s letter)
*Wherever Box’N" rakes are plying52 Kg 90 UTS rails shall be used irrespective of GMT of section. (1.2)
**On routes identified for running of 22.1 t. axle load wagons, 60 Kg rails of approved specifications shall be used on all routes except on ‘E’ routes with GMT less than 5, where 52 kg 90 UTS rails may be used at the discretion of CE.(3.4)
2. Type of Sleepers.
|
GMT |
A |
B |
C |
‘D Spl.’ |
D |
‘E Spl.’ |
E |
|
>20 |
60 Kg 1 |
60 Kg 1 |
60 Kg 1 |
60 Kg 9 |
60 Kg 1 |
60 Kg 9 |
60 Kg 1.2 |
|
10-20 |
60 7 |
60 7 |
60 7 |
60 9 |
60 7 |
60 9 |
52 7 |
|
5-10 |
60 7 |
52 1 |
52 1 |
60 9 |
52 1 |
60 9 |
52 1 |
|
<10 |
52 1 |
52 1 |
52 1 |
60 9 |
52 1 |
60 9 |
52 1 |
|
Sleeper |
PRC,W,ST 1 |
PRC,W,ST 1 |
PRC,W 1 |
PRC, 9 |
PRC,W,ST 1 |
PRC, 9 |
PRC,W,ST 1 |
(Suffix shows reference to Rly Bd’s letter)
**For routes identified for running 22.1 t. axle load wagons 60 Kg PRC (in special cases ST) sleepers shall be used irrespective of GMT of Section except ‘E’ having GMT less than 5 where 52 Kg rails may be provided .(3.4)
3. Sleeper density.
|
GMT |
A |
B |
C |
‘D Spl.’ |
D |
‘E Spl.’ |
E |
|
>20 |
1660 1 |
1660 1 |
1660 1 |
1660 8 |
1660 1 |
1660 8 |
1540 1 |
|
10-20 |
1660 1 |
1540 1 |
1540 1 |
1660 8 |
1540 1 |
1660 8 |
1540 1 |
|
<10 |
1660 1 |
1540 1 |
1540 1 |
1660 8 |
1540 1 |
1660 8 |
1310* 1 |
(Suffix shows reference to Rly Bd’s letter)
*Where Primary renewals are undertaken and there is potential of LWR track sleepers density may be kept as 1540.(1)
**For routes identified for running 22.1 t axle load wagons sleeper density of 1660/Km will be maintained. (4.5)
(ii) Track structure for
loop lines to permit 30 kmph speed.
|
Rail |
Sleeper |
Ballast |
Welding |
Switches |
|
90R.SWP: rail section should be same for turn-in curve and turn-out curve. 10,11,12 |
W,ST,CST9,PRC to M+4 density both for T/o and T/I curves. 10,11,12 |
150mm, out of which at least 75 mm should be clean. Shoulder ballast of 150 mm on outside of turn-in curve. 10,11,12 |
3 rail penels on loop stock rails and intermediate rails should be welded on straight & loop except heel of switches & crossing. 10,11,12 |
All switches must be curved. 10,11,12 |
(Suffix shows reference to Rly Bd’s letter)
*Turn in curve should conform to para 410 of IRPWM, 1986.
iii. Track Structure for private sidings.
- Considering that the traffic in private siding will be moved in block rakes and preferably in BOX’N wagons at a speed of 30-50 Kmph track structure on these sidings need to be upgraded than what has been stipulated in the past. In consideration of this, the following guidelines where issued:-
- Rails, 52 KG or 90R. in case of BOXN or 22 T axle load wagon, it should be 52 KG.
- If operating speeds are 30-50 Kmph, rails of T-18 quality may be used. For movement of BOXN and 22 T axle load, it should be T-18 quality irrespective of speeds. For other sidings, industrial quality rails may be used.
- T-12 quality second hand rails may also be used if supplied by railway, after ultrasonic testing.
- Rail should be welded in 3 rail panels.
- CST-9 or steel sleepers with M+4 density and minimum ballast cushion of 150 mm which should be raised to 250 mm in case of PRC sleepers.
(Authority
– Railway Board’s letter No. 91/CE-II/TS/2 dated 29-10-91) – Annex. 13