Page 441 - IRSEM_Main Book

(ii) Exact location of new signal or shifted signal shall be decided, based
on Signal Sighting committee report to be submitted as per Annexure:
19-A1 jointly by SSE(signal), traffic inspector and loco inspector, duly
observing Schedule of Dimensions given in Annexure: 19-A2.

(iii) Signals shall normally be placed on the left hand side of the relevant
track. However in exceptional circumstances and due to site constraints,
if any signal is to be placed on right hand side, in which case prior
approval of competent authority, shall be obtained and such right hand
signal shall be provided with an arrow mark (on rectangular plate with
white back ground) pointing towards the track to which that signal
pertains, to avoid any misjudgment by loco-pilot.

(iv) A new signal, which is yet to be operational, shall be turned away from
Track, must not be lit and shall be provided with a X across it.

(v) The visibility of existing signals shall be checked jointly by SSE (Signal),
traffic inspector and loco inspector and submit Signal Visibility
Certification as per Annexure: 3-A1 and a time bound action shall be
taken to improve the visibility, as per recommendation of the committee.

(vi) A Signal post, which is having implantation less than schedule of
dimensions, shall have infringing distance marked in red colour on white
back ground.

19.2.2 Mounting and Fixtures

(a) Colour Light Signals may be mounted on a rigid ground post or a signal
gantry. Route Indicators/Calling ON unit/Shunt signal unit to be provided
as required.

(b) Each signal unit shall be rigidly fixed in position. Markers to be provided to
identify type of signal such as ‘G’, ‘P’, ‘A’, ‘AG’, ‘D’, ‘ID’, ‘IB’.

(c) Signal posts shall be kept plumb and packed with suitable material.

(d) Suitable packing may be used to close the excess gap from post to signal
unit, surface base to post. The cable entry at the signal unit should be
provided with wooden plug around the cable to close excess gap to
prevent rodent entry.

(e) Enameled/Retro-reflective Signal number plate shall be provided. It should
be white back ground (for other than Gate stop signals) with black letters, as
shown in Drg. No. 19-D10 (sheet 3). For Gate stop signals, the back ground
shall be yellow colour.

(f) Alignment: Each signal unit shall be aligned correctly for better visibility.

(g) The signal ladder shall be firmly fixed with clamps and the bottom of ladder
ie the ladder shoe, shall be concreted firmly. The ladder alignment shall
meet the requirements of schedule of dimensions. Where infringing, the
signal ladder shall be blanked off (refer chapter no 1 item no 8 note (c) of
schedule of dimensions), by providing a metal sheet around the signal post
including ladder.

Chapter 19: Installation, Testing & Maintenance of Signalling Equipment Page 389 of 535