Page 535 - IRSEM_Main Book

(e) On curved track or in areas, where other obstructions such as buildings,
trees etc. exist, the site should be individually examined by the 'signal
sighting committee' for deciding the most appropriate location of the signal.

22.3.2 No portion of a post or fittings of a colour light signal shall infringe with the
schedule of dimensions from the centre line of the nearest track.

22.3.3 Signals without Junction Indicators Outside Tracks

(a) Distance of OHE masts shall be in accordance with Drg. No. 22-D6.

(b) The signal units shall be so fixed that the height of the centre line of the red
signal shall be approximately 3.65 meters above rail level. No part of
Signal without a route indicator shall normally be higher than 5.2 meters
above rail level.

22.3.4 Signals without Junction Indicators between Tracks

(a) If signals are located between tracks no OHE structures shall be provided
in the same track space for at least 600 meters in rear of the signals.

(b) Portal drop arms shall not normally be located at least for a distance of 600
meters before the signal in track space where signals are located.

(c) If a portal drop arm has to be unavoidably located in rear of signal itself, the
signal shall be mounted on an offset bracket. In addition special study shall
be made in each case to see whether the portal drop arm should also be
offset from the centre line of the track space in the direction opposite to the
offset of the signal. This special study shall be made for at least three portal
drop arms in rear of the signal and shall also cover the possibility of
shortening the portal drop arm.

22.3.5 Signals with Junction Indicators Outside Tracks

Signals with Junction Indicators outside tracks Setting distances of OHE masts
shall be in accordance with Drg.No. 22-D6.

22.3.6 Signals with Junction Indicators between Tracks

(a) Precautions and parameters for location of portal drop arms shall be as
specified under Para 22.3.4.

(b) For details of drawings, illustrating the above principles for Colour Light
Signals, refer to Drg.No. 22-D8.

22.3.7 The visibility of the signal shall be checked by day as well as by night by the
Official in charge (Signal) of the section after each phase of the O.H.E work,
i.e. erection of masts, provision of brackets, wiring, etc. If at any stage the
official feels that the visibility is not adequate, he shall impose suitable speed
restrictions and take such steps as are required to improve the visibility.
Note: For Details on Cable laying in RE Area, please Refer to Chapter 15 of SEM.

22.3.8 For Clearances for Signals for High Rise OHE (for Running Double Stack
Container & Three Tier Car), Please see Annexure: 22-A3 and Drg.No. 22-D7

Chapter 22: Requirements Of Signalling in 25 KV AC Electrified Area Page 478 of 535