Page 167 - IRSEM_Main Book

7.1.13 Placement of Distant Signal
(a) Distant Signal shall be placed at an *adequate distance in rear of the first

Stop Signal.
*Note: Such an adequate distance shall not be less than 1 kilometre in Single Distant
Territory

(b) In Double Distant territories: On sections, where Emergency Braking
Distance (EBD) of more than 1.0 km is to be catered for, a second
Distant signal shall be provided. Such a Distant signal shall be placed at
an adequate distance of not less than 2 kms in rear of First Stop signal
and Inner Distant Signal shall be placed at a distance of not less than 1
km in rear of First Stop signal.

Note: Both Distant and Inner Distant Signals shall be provided with a marker
consisting of a white coloured disc with letter 'P' in black.

7.1.14 Placement of Stop Signals

(a) Home Signal: The Home Signal shall be placed in rear of all
connections, if any, on the line to which it refers. The Home Signal shall

be placed at not less than *180 meters in rear of the points up to which
the line may be obstructed, after line clear has been granted to the station
in rear.

*Note:

(i) Where there is a continuous down gradient towards station steeper than 1 in
260 between Distant and Home signal in single distant territory and between
Inner Distant and Home Signal in Double Distant territories, the Home signal
may be placed at a distance of sum of Block Overlap and Signal Overlap from
BSLB (Block Section Limit Board) or the outer most Facing Point, as the case
may be (i.e 180 + 120 = 300 m in MACLS).
(ii) If there is rising gradient in between or there is no emergency crossover for
criss-cross movement cutting across the main line, then this shall not be
applicable.

(b) Routing Signal: A Routing Signal shall be placed in rear of the Points,
which it protects.

(c) Starter Signal: When one Starter Signal is provided for each converging
line, it shall be so placed as to protect the adjacent running line or lines.

Note: For long/curved platforms, a Starter Indicator may be provided to repeat the
aspect of the Starter as an aid to the Guard to enable him to know the aspect of the
Starter. The Starter Indicator shall exhibit no light when concerned Starter is at 'ON'
and yellow light when it is 'OFF'. This Indicator may be provided only where
essentially required.

(d) Intermediate Starter Signal: An Intermediate Starter Signal shall be
placed clear of fouling marks in rear of the points, if any, which it protects.

Chapter 7: Essentials of Signalling Page 136 of 535