How it Works / Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use

by Archibald Williams

Fig. 95.

On entering a signal-box a visitor will notice that the levers have different colours:—Green, signifying distant signals; red, signifying home and starting signals; blue, signifying facing points; black, signifying trailing points; white, signifying spare levers. These different colours help the signalman to pick out the right levers easily.

To the front of each lever is attached a small brass tablet bearing certain numbers; one in large figures on the top, then a line, and other numbers in small figures beneath. The large number is that of the lever itself; the others, called leads, refer to levers which must be pulled before that particular lever can be released.

Fig. 96.

Fig. 97.—Model signal equipment in a signalling school. (By permission of the "G.W.R. Magazine").

POINTS.