The following definitions are taken from the “General Code of Operating Rules”, effective April 28, 1985. And yes I know that the GCOR came into effect at two different dates depending on the railroad. I am using the date it first came into use.
A length of track in which no train or engine is permitted to enter while it is occupied by another train or engine.
A designated section of track or tracks within which the movement of trains will be governed by block signals, whose indications supersede the superiority of trains. The block signals may be controlled manually or automatically.
A block or interlocking (signal box) designated by an “A” marker or the absence of a number plate.
A series of consecutive blocks governed by block signals, cab signals or both, actuated by a train, engine or by certain conditions affecting the use of the block.
A system which provides for the automatic operation of the cab signals and cab warning whistle.
A system actuated by wayside inductors, so arranged that its operation will automatically result in the operation of the brakes until the train has been brought to a stop.
A length of track between consecutive block signals or from a block signal to the end of block system limits, governed by block signals, cab signals or both.
An indicator used to convey information regarding block occupancy.
A fixed signal at the entrance of a block to govern trains and engines entering and using that block.
A signal located in engineer’s (driver’s) compartment or cab, indicating a condition affecting the movement of a train or engine and used in conjunction with interlocking signals and in conjunction with or in lieu of block signals.
A remotely controlled block signal system under which train movements are authorised by block signals whose indications supersede the superiority of trains.
A siding within CTC or interlocking limits, the authorisation for use of which is governed by signal indication or control operator.
An absolute signal, the aspect of which, is controlled by a tower (signal box) operator (signaller).
A track connection between tow adjacent tracks.
The movement of trains on a main track, in one direction, specified by the rules.
A fixed signal outside of a block system, used to govern the approach to a block signal, interlocking signal or switch point indicator. It will not convey information as to conditions affecting the use of the track between the distant signal and block signal (Home Signal), interlocking signal or switch point indicator to which the approach is governed. It will be identified by a “D” marker.
A portion of the railroad designated by timetable.
Two main tracks, on one of which the current of traffic is in a specified direction, and on the other in the opposite direction.
A power-operated switch, also equipped for hand operation.
An electrically controlled lock device affixed to a hand operated switch or derail to control its use.
A unit propelled by any form of energy, or a combination of such units operated from a single control, used in train or yard service.
A train not authorised by timetable schedule. It may be designated:
- Extra: For any extra train except work extra, the movement of which is authorised in a specific direction.
- Work Extra: For an extra train authorised by Form H train order, the movement of which may be within either direction within specified limits.
A signal of fixed location indicating a condition affecting the movement of a train.
The first station on each subdivision from which a train is authorised to occupy the main track.
An arrangement of signal appliances so interconnected that their movements must succeed each other in proper sequence. It may be operated manually or automatically.
The tracks between the outer opposing absolute signals of an interlocking.
The fixed signals of an interlocking, governing trains using interlocking limits.
A track extending through yards and between stations which must not be occupied without authority or protection.
Two or more main tracks, the use of which is designated in the timetable.
A sign mar