2. What is SOD ?
Schedule of dimension is nothing but a
schedule, which lays down :-
Limiting values, recommended values,
and infringement to limiting values,
which can be continued over entire
Indian railways system for various track
parameters.
Goods wagon and coaching stock
parameters.
Horizontal and vertical clearances to be
followed on Indian railways.
3. Necessity of S O D
It is absolutely essential to ensure safety of
traveling public as well as goods over entire
Indian railways system.
To adopt uniform system of track tolerances,
location of structures and construction
standard all over the Indian railways.
To permit different types of coaching and
goods stock owned by different railways to
ply on entire railway system with same level
of degree of safety.
4. Brief Introduction
1913 - First schedule of maxm & minm
dimension.
1922 – SOD with Maxm. Minm & recommended
dimension was published.
1929 – Amendment in order to introduce some
improvement and additions of clearances
required for electric traction.
1936 – Financial stringency on railway therefore
amendment to restrict capital expenditure to
minimum.
5. Contd. ….
1939 & 1958 reprinted with some modifications.
1973 – Reprinted with conversion to metric
system, introduction of dimensions for 25KV AC
traction.
1990 – Recommendations of 64th Track
Standard Committee for revision of SOD of
1939 reprinted in 1973.
2004 – Revised version published with some
modifications.
6. MAIN FEATURES OF SOD-2004
Dimensions are given only for 1676 mm
gauge.
Consists of only metric units.
Only two schedules – schedule I & schedule II
Extra clearances required for curves are
modified to suit speed of 160 kmph and SE of 165
mm
Additional appendix for extra clearances required
for 200 kmph is also given with 185 mm SE
7. SCHEDULE - I
Schedule I of SOD-2004 consists of those
items which are mandatory and have to be
observed on all 1676 mm gauge Railways in
India.
Contains the items of Schedule- I and certain
selected items of Schedule- II of 1973 Version
8. Contd. …
DIMENSIONS given in Schedule-I are classified
under two heads :-
‘Existing works’ – The works which were
existing before issue of SOD ( 2004 ).
‘New works’ – Include new constructions,
additions of new lines/structure, gauge
conversion and doubling
9. Contd. …
However following works will not be included in
‘New works’-
Shifting of Points & Crossings.
Extension of siding.
Extension of building, etc.
10. SCHEDULE - II
Schedule – II contains the existing
infringements of Schedule – I.
These are items, which were included in
Schedule – III of 1973 version.
11. CONTENT OF S.O.D.
SCHEDULE I :-i) ESSENTIAL FOR SAFETY
ii) PRIOR SANCTION FOR
DEVIATION
CHAPTER DETAILS
I GENERAL Spacing, ,Curves, Br.Bldg Structure,
Tunnel, Sig Gear, locking etc.
II. STN YARD Pts.& Crossing, P/F, Bldg/St,
Tr.Spacing etc.
12. Contd. …
III –W/Shop &
Sheds
Tr,Spacing, O/Head
Girder Structure.
IV –(A) Rolling
stock (C&W)
Wheels /Axles, Wheelbase,
Buffers / Couplings,Floor
height Max.moving
dimensions
IV-(B)- Rolling
Stock (3660 mm) -
Max. future moving
dimensions.
14. SCHEDULE I CHAPTER I
MIN. DIST. C/C OF TRACK .
As per CS No.9 dated.16.10.2012
i) For existing works 4265 mm
ii) For new works/additions
to existing works 5300 mm
Note: OHE mast and Signal post shall not
preferably be provided in between tracks.
However, under unavoidable circumstances, the
clearance shall be increased by equal to width
of such structure/foundation.
15. SCHEDULE I CHAPTER I
MIN. DIST. C/C OF TRACK
(Tunnel, Semi-through/Through girder bridges)
As per CS No.9 dated.16.10.2012
i) For existing works 4495 mm
ii) For new works/additions
to existing works 4725 mm
16. Contd. …
Minimum Radius of curves -175 m (10 degree)
Note: Check rails to be provided in curves having
radius 218 meters(8 degree) and sharper.
Check rails may also be provided in flatter
curves, if high speed is contemplated.
17. Contd. …
A) Maximum clear distance bet. two sleepers on
bridge:-
i) on existing Bridges 510 mm
ii) New construction & on existing bridges
during regirdering /TSR
450 mm
B) Maximum distance between Joint
sleepers on Bridges.
200 mm
18. Contd. …
Minimum thickness
of Bridge timber,
exclusive of
notching.
150 mm
Minimum length of
bridge sleeper.
305 mm +
dist. from out
side to
outside of
girder flange
(subject to
min.2440
mm)
19. SCHEDULE I CHAPTER I
CONTD…
Minimum clearance of
check rail on curve. 44 mm.
Minimum clearance of
check rail on level crossing. 51 mm.
Maximum clearance of check
rail on level crossing. 57 mm
Minimum depth for wheel flange. 38 mm
20. Schedule I chapter I contd. …
BULDING AND STRUCTURE
Minimum horizontal distance from center
of track to any structure from RL to
305 mm above RL
i) For existing works 1675 mm
ii) For new works or alterations
to existing works 1905 mm
21. Minimum horizontal distance from C/L of track to
any structure except a platform.
i)For existing works.
From 305 mm to 4420 mm
above RL.
2135 mm
ii) For new works or alterations
to new works
From 305 mm to1065 mm
above R L
1905 mm
increasing to
2360 mm
From 1065 mm to 3355 mm 2360 mm
22. Contd. …
From 3355 to 4420 mm
above rail level
2360 mm
decreasing to
2135 mm
From 4420 to 5870 mm
above rail level
2135 mm
decreasing to 915
mm
23. Contd. …
Below the rail level up to the
formation level on the straight
track and curve up to 875 m
2575 mm
Below the rail level up to the
formation level on the curve
Radius< 875 m
2725 mm
24. Schedule I Chapter I contd. …
Minimum horizontal distance of any telegraph
post from C/L of nearest track
i) For existing works - Ht of the post +
2135 mm.
ii) For new works - Ht of the post +
2360 mm.
25. Height of ROB & FOB (C.S.No.7/13)
Min. ht. above rail level for a dist. Of 1600
mm on either side of the centre of track.
Where 25 K.V. A.C. traction is likely to be
used.
F.O.B. 6250 mm (5270 mm)*
R.O.B./ Fly over 5870 mm (5070 mm)*
* For 4.80 M height of contact wire
26. C.S.No.10 Dated 08.11.12
Note for overhead structure-
For existing overhead structures, wherever
feasible, the ht. of contact wire shall be as high as
possible to allow passage of ODC of 4.8 m height.
If any T/out or X/over is within 40m or any LC is
within 520m, the ht. shall be 6250m
On lines proposed for electrified, provision shall be
made in OHE structure to permit an allowance of
275mm for raising of track
27. Contd. …(CS No.13 dt. 21.10.13 )
Minimum height above rail level for
telegraph, telephone and other such
low tension wires crossing a railway
6100 mm
The minimum horizontal distance from
centre of nearest track to structure
carrying electrical conductors crossing
a railway (For existing work)
Height of
structure +
2.135M
----------do------------(For new work) Height of
structure + 6
meters
28. Schedule I chapter I contd. …
Safety Refuges :-
Max. distance in tunnels 100 m
On bridges with
a)span less than 100 m 100 m
b)spans of 100 m or more - On each pier
29. Provision of Trolley refuse as per CS No 116
of IRPWM
Location Distance
Maximum distance should not be more than 1Km subject to
following
Cutting in straight 200M
Cutting in curve 100M
High Embankment 200M
Tunnel 100M
Bridges with span less than 100 m 100M
Bridges with spans of 100 m or more On each pier
On Ballasted deck bridges 50M
30. Interlocking and signal gear
Description Dimension
Maximum height above rail level of any part of
inter locking or signal gear for a width of 1600 mm
or 1830 mm in case of tunnels, through and semi-
through girders on either side of centre of track
64 mm
Note: 1. For a distance of 229 mm outside and 140mm inside
the gauge faces of the rail, no gear or track fitting must project
above rail level
2. Metal covers with ramps on both sides must be provided
over interlocking gear to prevent hanging coupling from
damaging the gear.
31. Schedule I chapter I contd. …
Formation width :- (Considering formation slope of
1 in 30 and track distance 5300mm and straight track)
For single line straight track –
Min. width in embankment 6850 mm
Min. width in cutting 6250 mm
For Double line straight track –
Min. width in embankment 12150 mm
Min. width in cutting 11550 mm
32. Formation width as per CS No.16 of
LWRM and CS No.135 of IRPWM
For Single Line Formation Width
For Embankment 7850 mm
For cutting 7850 mm
For Double Line
For Embankment 13160 mm
For cutting 13160 mm
33. Gauge on straight and curves
Alignment Gauge tolerance
Straight including curves of
350 M
-5 mm to +3 mm
(1671 to 1679mm)
Curves less than 350 M Up to +10 mm
(Up to 1686 mm)
34. Schedule I chapter II
(Station yard)
Min. dist. Centre to centre of track :-
(i) For existing works 4265 mm
(ii) For new works / Alt. 5300 mm
Max. gradient in Station yard :-
(i) For existing works 1 in 400
(ii) For new works / Alt. 1 in 1200
Note: There must be no change of grades
within 30 meters of any points & crossings.
35. The power of condonation for gradient
steeper than 1 in 1200 in case of new work
(As per Corrigendum to C.S. No.12)
Gradient Authority
Steeper than 1 in 1200 and
up to 1 in 400
Personal approval of G. M.
through COM of the zonal
Railway after making efforts for
providing grade as flatter as
possible
Steeper than 1 in 400 and
up to 1 in 260
C.R.S.
Steeper than 1in 260 Railway Board through C.C.R.S.
36. Chapter ii contd. …
Horizontal dist. From C/L of track to
Face of platform
coping
Max.
1680 mm
Min.
1670mm
Face of goods
platform coping
1680 mm 1670 mm
Face of any platform
wall
1905 mm 1675 mm
New platform wall should be built to maximum
dimensions and the coping corbelled out to 1675mm.
37. Platform on curved track
No passenger platform in case of new line,
would be constructed on a curve having
radius less than 875 M
Extra allowance to be reduced by 51mm for
platform, inside of curve.
Extra allowance to be reduced by 25mm for
platform, outside of curve.
38. Chapter ii contd. …
Height above rail level –
For high level
passenger platform
Max.
840 mm
Min.
760 mm
For medium level
passenger platform
455 mm -
For goods platform 1065 mm -
39. Railway Board’s directives for
Mumbai suburban section
Vide letter No.2007/CEDO/SD/O dated
19.02.14, Railway Board has conveyed Board’s
approval to change the height range of platform
in Mumbai suburban section from 760-840mm
to 840-920mm.
RDSO has been asked to submit draft
correction slip for Board’s approval which is yet
to be issued.
40. Chapter II Contd. (Buildings and structures)
Minimum Horizontal distance of any building on
a passenger platform from center of track.
Height of the structure Distance
From P/F level to 305 mm above P/F level 5180mm
5330mm
From 305mm above P/F level to 3430mm
above RL
5330mm
From 3430 to 4115mm above RL for existing
work and
5330mm
3810mm
From 3430 to 4610mm above RL for new work
41. Contd. ….. (CS No. 11)
Min. horizontal distance of any bldg. or
longitudinal boundary fence from centre line
of track of passenger platform which is not
an island (For New works)
Minimum 6830mm
Recommended 12130mm
Note: Recommended dimension is for setting back
the platform to make room for an additional track
in future, without infringing minimum distance.
42. Chapter No. 2 contd. ….
Minimum horizontal distance from center line of
track to a pillar, column, lamp of similar isolated
structure on a passenger platform.
Height Distance
From platform level to
305mm above platform level
4570mm increasing
uniformly to 4720mm
From 305mm above
platform level to 3705mm
above rail level
4720mm
43. CHAPTER II CONTD…
POINTS & CROSSINGS :- Clearance of
Check rail opposite nose of
crossing
Max.
48 mm
Min.
44 mm
----------------Do------------------
(In case of PRC T/O )
45 mm 41 mm
Wing rail at nose of crossing 48 mm 44 mm
------------------Do---------------
(In case of PRC T/O )
45 mm 41 mm
44. Chapter ii contd. …
Points & Crossings :-
Clearance bet. Toe of open switch and
stock rail.
(i) For Existing work 95 mm
(ii) For new work or alteration to existing
work
115 mm
Minimum Radius of curvature for Slip
points, Turn outs, Cross over.
218 m
45. Chapter ii contd. …
Points & Crossings :-
Minimum angle of crossing. (ordinary) 1 in 16
Crossing as flat as 1 in 20 will usually be sanctioned
if recommended by CRS.
Minimum length of Tongue Rail. 3660 mm
Diamond crossing not to be flatter than 1 in 8 1/2
Diamond crossing as flat as 1 in 10 will usually be
sanctioned if recommended by CRS.
46. Length of siding for New work (C.S. No.8)
Condition Length of siding
Where the ruling gradient is
1in 100 and flatter
750 Meters
Steeper than 1 in 100 Length of longest train permitted
in the section + 35 M
Clear available length denotes :
1. Distance between foot of signal and FM in rear on the same
line in case of main line and Directional loop at station yard
2. In case of common loop, distance between two starter
signals of opposite direction on the same line.
47. Maximum Moving Dimensions
Description 3250mm
wide stock
3660mm
Wide stock
Max. width over all projections, at
305mm above RL, when fully
loaded
3135mm 3505mm
Max. width over all projections
from 305mm to 1082/1145mm
above RL when fully loaded
3250mm
3135mm
3660mm
3505mm
Max. width with over open doors,
including all projections for goods
vehicle
4265mm 4725mm
Max. height above RL for a width
of 760mm on either side of the
centre of unloaded vehicle
4265mm 4725mm
48. SCHEDULE I CHAPTER IV (A)
Wheel Gauge 1599mm-1602mm.
Tread Dia of new wheel 914mm-1092mm.
Flange Projection 28.5mm-35.0 mm
Flange Thickness 16 mm- 29.4 mm*
* As per CS No.14
50. SCHEDULE I CHAPTERIV(A) CONTD…
Min.Wheel base for bogie truck 1830mm.
Min. Wheel base for pass. Bogie 2440mm.
Min. Dist. Bet bogie centres 2/3 vehicle
length
Max. Dist bet. Bogie centres: 14.900m.*
* CS No.14
Max. Lenth of body or roof:
4-Wheeler (3200mm wide )
Bogie vehicles (3250mm. Wide)
8540mm.
21340mm
51. SCHEDULE V (A) A.C.
MIN. HT. OF UNDERSIDE OF LIVE WIRE:
BRIDGES & TUNNELS 4800mm
IN OPEN 5500mm
SHEDS 5800mm
LEVEL CROSSINGS 5500mm
MAX. VARIATION OF LIVE WIRE EITHER SIDE :
STRAGIHT 200mm
CURVES 300mm
MAX. WITDTH OF PENTOGRAPH 1800mm
52. SCHEDULE-II
Min. dist C/L to C/L of track
i)for 3250mm wide stock 3660 mm
ii) for 3660mm wide stock 4040 mm
Min. clear dist. From C/L
of Track to any fixed structure
From RL to 1065 mm above
Rail level 1675/1905mm
53. Contd. …
From 1065mm to 3505mm
above R/L 1980/2135mm
4265 mm above R/L 2055 mm
( with SR 16 kmph ) 1980 mm
Min. clear height above R/L
for a dist. of 305 mm/915 mm on either
of centre of track 4420 mm / 5030 mm
54. Over-dimensioned consignment
When a consignment whose length,width and
height are such that one or more of them
infringe the standard moving dimension at any
point during the run from start to destination,
then the consignment is called O.D.C.
55. Class ‘A’ O.D.C.
(Permitted out of gauge loads)
Which exceed the maximum moving
dimensions but do not infringe any fixed
structure on the route by a net clearance of 150
mm and above and gross clearance 225 mm
and above.
56. Contd. …
Class ‘B’ O.D.C.(Exceptional out of gauge load)
– Net clearance not less than 75 mm but less
than 150 mm, gross clearance 150 mm to 225
mm.
Class ‘C’ O.D.C.-(Extraordinary out of gauge
loads) Net clearance are less than 75 mm and
gross clearance less than 150 mm
57. Speed Restrictions for ‘A’ Class
O.D.C.
Gauge Speed Restriction Escort Sanctionin
g authority
B.G Sectional speed of
four wheeler
30 kmph where gross
clearances is less
than 380 mm.
Movement by
day/night
Not
required
COPS
58. Speed Restrictions for ‘B’
Class O.D.C.
Gauge Speed Restriction Escort Sanctionin
g authority
B.G. 40 kmph by day and
night During night stop
dead and proceed
slowly at approach of
structure having gross
clearance less than 225
mm.
SSE
(C&W)
T.I.
CE
59. Speed Restrictions for ‘C’
Class O.D.C.
Gauge
Speed
Restriction
Escort Sanctioning
authority
B.G. 25 kmph
Movement
by day
only
SSE/SE
(C&W)
T.I.
SSE/SE
(P.Way)
TRD staff
CRS
