Speed Signalling.

A notable departure from previous principles of signalling is made by the three position signalling, either arm or colour light. These new signals indicate to the driver not only whether to proceed or not, but tell him the condition of the line ahead and at what speed to travel. On approaching a station the driver knows by the signals whether his route is set and clear. The signalman may make a mistake with regard to the condition of the road, but the electrified track will correct this and give the proper warning signal to the driver, should his route be occupied or fouled. On the open track the signals show the track conditions for a mile or so ahead and this certainty assists drivers in maintaining time and eases the nervous strain on the “human element.”