A form of 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 which maintains the locking associated with a RouteThe path along a section of track between one Signal and the next, along which an authorised movement is to be made. More
in use until after the train has passed clearA Colour Light Signal that is displaying a Proceed Aspect or a Semaphore Signal in the Off position. More of the equipment being LockedThe state of any Signalling Function or item of equipment when it is conditionally or unconditionally prevented from changing state or position by other parts o... More
(for example, PointsItems of permanent way which may be aligned to one of two positions, Normal or Reverse, according to the direction of train movement required. More or opposing SignalA visual display device which conveys instructions or provides prior warning of instructions regarding the driver’s authority to proceed. More). The releaseThe removal of Locking on a function, for example, the removal of Route Locking or the unlocking of a function such as a Ground Frame. More may be effective only
after a time delay. Also known as Maintained LockingAn alternative to the term Route Locking. More or Route HoldingAn alternative to the term Route Locking. More.