Page 471 - IRSEM_Main Book

Annexure: 19-A1 (Sheet 3 of 3)

2 Schedule of dimension (SOD) - Considerations

(a) Minimum horizontal distance from centre of the track (Implantation) to any
structure as per schedule of dimension. Please refer Annexure: 19-A2 of SEM
(b) Each signal post shall be marked with it`s Centre to centre (Implantation) distance
to track/ Tracks in Black colour in white background for Normal Implantation and
in Red colour with white background for reduced implantation.

(c) If any signal post and/or any of it`s components are infringing with schedule of
dimensions, such post shall be painted with alternate Red & white stripes at Loco
Pilot`s eye level (3.65 m) and it`s Centre to centre distance to adjacent Track(s)
shall be marked in red colour on a white background on the signal post itself,
showing an arrow towards infringing track, for easy identification.

3 Precautions in RE area extract from ACTM para 16.4 to 16.5 of Appendix I

(a) If any portion of a signal post or its fittings falls within 2 meters of a 25 KV live
conductor, or any it`s metal part, such portion shall be protected by an iron
screening solidly connected to the structure. If not, a Caution Board shall be
provided on the signal post at a height of 3 meters above the rail level, to caution
the staff.
(b) Neutral section shall be located away from stop signals, level crossing. If neutral
section is provided after a stop signal, the distance* between signal and neutral
section shall be such that after stopping, the train shall be able to pick up enough
speed to coast through the neutral section without any risk of stalling. If neutral
section is provided before a stop signal, the distance* between neutral section
and signal shall be such that the train shall not cross the signal in an effort to
coast the neutral section.
*Note: The distance should be preferably 1600 meter away on section with gradient
up to 1 in 300 and 2500 meter with higher steeper gradient up to 1 in 200, if
unavoidable. If PTFE type short neutral section has been used, this distance can be
reduced to at least 400 meter after the stop signal and 200 meter before the stop
signal.
4 Please also refer to Extracts of Para 20.5 of Appendix-1: Manual of AC Traction -
Volume II (Part-II) for placement of signals in RE area, given at Annexure: 22-A1.

5 Any other stipulation as given by Railway Board & RDSO from time to time shall also
be followed.

Chapter 19: Installation, Testing & Maintenance of Signalling Equipment Page 417 of 535