GENERAL DESCRIPTION OF SIGNALS
Aspects of fixed signals are shown by the position of semaphore arms, color of lights, flashing of lights, position of lights, or any combination thereof. They may be qualified by number plate, letter plate, marker, shape and color of semaphore arms, or any combination thereof.
Block and interlocking signals, as far as practicable, are located
to the right of, and adjacent to, or directly over the track which they
govern.
When it is not practicable to locate signals to the right of, or directly
above the track which they govern, two signals may be bracketed and located
on the supporting mast for displaying indications on two tracks, right-hand
signal governing right-hand track and left—hand signal governing
left-hand track.
When a track intervenes to the right between a signal and the track governed,
a stub post with the prescribed marker will be placed to the right of
the signal.
When a track intervenes to the left between a signal and the track governed,
a stub post with the prescribed marker will be placed to the left of the
signal.
Fixed signals of the semaphore type display their indications by arm,
or arms, to the right of the signal mast and in addition, by night, display
lights of the prescribed color as viewed from an approaching train.
Fixed signals of the color light type display their indications by lights
of prescribed color or flashing of such lights as viewed from an approaching
train.
Fixed signals of the position-light type display their indication by lights
arranged in the prescribed position.
Stop signals have no number plates. Stop-and-proceed signals are designated
by number plates.
Block signal numbers indicate their location approximately in miles and
tenths according to mile posts.
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