Page 534 - IRSEM_Main Book

22.2.8 Location of Neutral Section(Reference: Para No. 16.4 to 16.5 of ACTM,
Appendix I)

Para Neutral section shall be located away from stop signals, level crossing and
No. 16.4 shall be on tangent track and on level to the possible extent.

Para If neutral section is provided after a stop signal, the distance* between signal and
No. neutral section shall be such that after stopping, the train shall be able to pick up
16.4.1 enough speed to coast the neutral section without any risk of stalling.

Para If neutral section is provided before a stop signal, the distance* between
No. neutral section and signal shall be such that the train shall not cross the
16.4.2 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.

The PTFE type short neutral section shall be located on level tangent track at least 400 m
after the stop signal and 200 m before the stop signal. Where, however, modifications
require to comply with these guide lines are difficult or entail heavy investment, the Chief
Electrical Engineer of the Railway may direct any other arrangement to be followed
consistent with safety and reliability, and for location on graded section according to para
16.4.1 and 16.4.2. (Para No. 16.4.5 of ACTM).

Section 3: Erection of Signals in RE Area

22.3.1 Location of Signals in RE Area

Normally, all signals should be located on the left side of the track for which it
refers. In exceptional cases the signals may be located on the right side. To
ensure adequate visibility of signals the OHE masts should be implanted as
per the ACTM. In case it is not possible, offset brackets may be used for signal
units without affecting the schedule of dimensions. Further the following steps
should be taken to achieve adequate visibility.

(a) In case the traction mast is located in front of the signal post, the distance
between the traction mast and signal post should not be less than 30
meters. In addition, it should be ensured that no traction mast is located in
advance of the signal post at a distance less than 10 meters.

(b) PCSTEs and PCEEs of the zonal railways shall give dispensation for
reduction in the distance of placing mast in front of the signal from 30
meters to 10 meters on straight track after ensuring staggering for proper
visibility of signal as per provisions of ACTM and SEM.

(c) The signal post should be sufficiently high so as to be seen clearly.

(d) On tangent tracks it is desirable that the signal should be located within the
OHE structure, i.e. the implantation of the signal from the track centre shall
be less than the implantation of the OHE mast from the track centre. The
setting of OHE masts in the vicinity of the colour light signals shall be as
per para 20.5 of Appendix-I of the AC Traction Manual, Vol-II (Part-II).
Relevant extracts as in Annexure: 22-A1.

Chapter 22: Requirements Of Signalling in 25 KV AC Electrified Area Page 477 of 535