Page 287 - IRSEM_Main Book

(c) on the same post as, but 1.5 meters to 2 meters below the Last Stop
Signal of a station in rear.

(d) Warner Signal below a Stop Signal: When the Warner Signal is placed
below a Stop Signal, the variable light of the Stop Signal shall take the
place of the fixed green light of the Warner Signal and the arrangements
shall be such that the Warner Signal cannot be taken 'OFF' while the Stop
signal above it is 'ON'.

12.5.5 Stop Signals

(a) Semaphore arm: The Semaphore arm of a Stop Signal shall be square
ended. The front of the arm shall be red with a white bar. The back of the
arm shall be white with a black band. The bars shall be parallel to the end
of the arm.

(b) Day and night indications: By day the arm of a Stop Signal shall be
horizontal in the 'ON' position and 45° to 60° below the horizontal in the
'OFF' position. By night, the signal shall display a red light in the 'ON'
position and a green light in the 'OFF' position.

12.5.6 Location ofStop Signals

(a) Outer Signals: The outer signal where provided or the Home Signal,
where an outer Signal is not provided, shall be placed not less than 400
meters in rear of the Points up to which the line may be obstructed after
Line Clear has been given to the Station in rear.

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

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

(d) Starter Signals

(i) A starter Signal shall be placed at not less than 400 meters in advance
of the Home Signal.

(ii) Where a Starter Signal is provided for each converging line, it shall be
placed as to protect the adjacent running line or lines.

(iii) Where one starter Signal only is provided for two or more converging lines,
it shall be placed outside the connections on the line to which it applies.

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

(f) Advanced Starter: 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 placed at not less than 180 meters from
the outermost point in the case of single line section. This distance shall
be reckoned from the starter in the case of double line section. On special
nominated sections, the portion between the fouling mark to block section
limit shall be track circuited when

Chapter 12: Installation, Testing & Maintenance of Mechanical Signalling Equipment Page 241 of 535