GCOR Definitions
(ABS) Automatic Block Signal - answer A series of consecutive blocks governed by
block signals, cab signals, or both. The Signals are activated by a train or by certain
conditions.
Distant Signal - answer A fixed signal outside a block system that governs the approach
to a block signal, interlocking signal, or switch point indicator.
Electric Switch Lock - answer An electrically controlled lock that restricts the use of a
hand-operated switch or derail.
Engine - answer A unit propelled by any form of energy or more than one of these units
operated from a single control.
Fixed Signal - answer A signal that is fixed to a location permanently and that indicates
a condition affecting train movement.
General Track Bulletin - answer A notice containing track bulletin restrictions and other
conditions affecting train movement.
Interlocking Limits - answerThe tracks between outer opposing absolute signals of an
interlocking.
Main Track - answerA track extending through yards and between stations that must not
be occupied without authority or protection.
Reverse Movement - answerA movement opposite the authorized direction.
Signal Indication - answerThe action required by the signal aspect.
Spring Switch - answerA switch with a spring mechanism that returns the switch points
to the original position after they are trailed through.
Timetable - answerA publication with instructions on train, engine, or equipment
movement. It also contains other essential information.
Track Bulletin - answerA notice of conditions affecting train movement. It may also
authorize movement against the current of traffic where Rule 9.14 (Movement with the
current of Traffic) is in effect.
Train - answerOne or more engines coupled, with or without cars, displaying a marker,
and authorized to operate on a main track.
(ABS) Automatic Block Signal - answer A series of consecutive blocks governed by
block signals, cab signals, or both. The Signals are activated by a train or by certain
conditions.
Distant Signal - answer A fixed signal outside a block system that governs the approach
to a block signal, interlocking signal, or switch point indicator.
Electric Switch Lock - answer An electrically controlled lock that restricts the use of a
hand-operated switch or derail.
Engine - answer A unit propelled by any form of energy or more than one of these units
operated from a single control.
Fixed Signal - answer A signal that is fixed to a location permanently and that indicates
a condition affecting train movement.
General Track Bulletin - answer A notice containing track bulletin restrictions and other
conditions affecting train movement.
Interlocking Limits - answerThe tracks between outer opposing absolute signals of an
interlocking.
Main Track - answerA track extending through yards and between stations that must not
be occupied without authority or protection.
Reverse Movement - answerA movement opposite the authorized direction.
Signal Indication - answerThe action required by the signal aspect.
Spring Switch - answerA switch with a spring mechanism that returns the switch points
to the original position after they are trailed through.
Timetable - answerA publication with instructions on train, engine, or equipment
movement. It also contains other essential information.
Track Bulletin - answerA notice of conditions affecting train movement. It may also
authorize movement against the current of traffic where Rule 9.14 (Movement with the
current of Traffic) is in effect.
Train - answerOne or more engines coupled, with or without cars, displaying a marker,
and authorized to operate on a main track.
