Control systems for controlling the passage of vehicles

Abstract From the Canadian patent

Control Systems for controlling the passage of Vehicles An improved control system is described for controlling the passage of a vehicle between certain control points the, control is achieved by passing electronic tokens which permit, movement of the vehicle past a control point between a signal, box and the vehicle via a first data communications channel which is security interlocked by solid state interlocking in the data channel. A communications processor is included in the interlocking and forms part of the vital safety system of the interlocking. The improvement comprises the provision of a second data communications channel between the signal box and train, this second channel …