Page:The Working and Management of an English Railway.djvu/97

 distance from them than 200 yards, unless repeater signals or duplicate locking bars are provided.

Junction signals for protecting a junction in the trailing direction (i.e., a junction formed by the connection of one line with another, not by meeting or facing points, but by trailing points) to be fixed a sufficient distance from the fouling point to afford some margin for a driver who may accidentally draw past the signal.

Junction signals are not in any case to be placed on the same post one above another, but a separate post is to be provided for each signal.

Platform Starting Signals.—These are sighted at a height of about 15 feet above rail-level, and so as to be seen by a driver the whole length of the platform. This rule, however, is not strictly applicable if the same post carries the distant or home signal for a cabin in advance, in which case the signals are sighted as home or distant signals, as the case may be.

Advanced Starting Signals.—These are to be sighted of a uniform height with platform starting signals, and are to be seen by a driver from the platform starting signal. They must not in any case be at a greater distance in advance of the cabin than 350 yards, and must be clearly in view of the signalman.

General Rules.—Bay starting and other subordinate signals are to be of a uniform height of 15 feet from rail level, and are to be provided with short arms and purple lights instead of red.

Lamps are never to be placed nearer together than 7 feet, except in the case of subordinate signals.

Signals elevated more than 45 feet above rail-level are to have a lower arm on the same post, 15 feet above rail-level, so as to be visible in fogs or thick weather.