Page 290 - IRSEM_Main Book

12.5.14 Location 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 not
less than 180 meters in rear of the points upto which the line may be
obstructed after line clear has been granted to the station in rear.

(b) Routing Signal: A Routing Signal shall be placed as in Para 12.5.6 (c).

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

(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.

(e) Advanced Starter Signal: Unless approved under special instructions,
an Advanced Starter Signal shall be placed outside all connections on the
line to which it applies. It shall be located at a distance of not less than
120 meters from the outermost points in the case of Single Line Section.
This distance shall be reckoned from the starter in case of Double Line
Section. On special nominated sections the portion between the fouling
mark to block section limit shall be track circuited when

(i) visibility of the portion between fouling mark to block section limit is
obscured from the place of operation; or
(ii) frequent shunting involving main lines takes place; or

Advanced Starter is placed at a distance of full train length beyond the
trailing points.

12.5.15 Calling On signal

(a) The Semaphore arm of a Calling-on Signal: By day, the Semaphore
arm of a Calling-on Signal shall be-

(i) Horizontal in the 'ON' position, and
(ii) 40° to 45° above the horizontal in the 'OFF' position.

12.5.16 Holding Route

(a) Signals governing movements over Points shall be placed as close as
possible to the Points. Where a signal is more than 180 meters from the
Facing points it controls, arrangements shall be made to keep the Points
locked until the train has passed them. Similar arrangements shall also be
made to hold consecutive Points, where the distance between them
should be more than 180 meters.

(b) At a station where trains run through at speeds more than 50 kilometers
per hour, such arrangements to hold the route are also required in case of
trailing points situated more than 180 meters from the signal controlling
them. However, such arrangements are not required if the Points are
locked in either position by the signal in advance.

Chapter 12: Installation, Testing & Maintenance of Mechanical Signalling Equipment Page 244 of 535