InterlockingA general term applied to the setting and releasing of Signals and Points to prevent unsafe conditions arising; also the equipment which performs this function.... More between a SignalA visual display device which conveys instructions or provides prior warning of instructions regarding the driver’s authority to proceed. More (usually a platform starting SignalA Stop Signal located such that either: • the longest passenger (or empty coaching stock) train authorised to use the platform would, if stopped at the Signal... More) and a CallOn Class RouteThe path along a section of track between one Signal and the next, along which an authorised movement is to be made. More leading up to the SignalA visual display device which conveys instructions or provides prior warning of instructions regarding the driver’s authority to proceed. More.