GCOR Practice Test Questions And Answers | Updated
RATED A+ 2026 | NEW
Dual Control Switch
A power operated switch, movable point frog, or derail that can also be operated by hand.
Electric Switch Lock
An electrically controlled lock that restricts the use of a hand operated switch or derail.
Absolute Signal
A block or interlocking signal without a number plate or designated by an A marker.
Automatic Block System (ABS)
A series of consecutive blocks governed by block signals, cab signals, or both. The signals are
activated by a train or by certain conditions that affect the block use.
Block
A length of track between consecutive block signals or between a block signal and the end of
block system limits.
Centralized Traffic Control (CTC)
A block system that uses block signal indications to authorize train movements.
Control Operator
An employee assigned to operate a CTC or interlocking control machine or authorized to grant
track permits.
Control Point
The location of absolute signals controlled by a central operator or a railroad identifiable point
as defined in the Timetable.
Controlled Siding
A siding within CTC and Interlocking limits where a signal indication authorizes the siding's use.
Controlled Signal
An absolute signal controlled by a control operator.
,Controlled Track
Track upon which the railroad's operating rules require that all movements of trains must be
authorized by a train dispatcher or a control operator.
Crossover
A combination of two switches that connect two adjacent tracks.
Interlocking Signals
The fixed signals of an interlocking that govern trains using interlocking limits.
Loaded Bulk Commodity Train
Loaded Unit Trains are defined as a train of 50 or more loaded cars in a block, each weighing
125 tons gross weight or more (bulk commodities), such as coal, grain, soda ash, etc.
Main Track
A track extending through yards and between stations that must be occupied without authority
or protection.
Non-Controlled Track
Track upon which trains are permitted by railroad rule or special instruction to move without
recieving authorization from train dispatcher or control operator.
Off-Track Equipment
Machines that may be operated on the right of way foul of track.
Proceed Indication
Any block signal indication that allows a train to proceed without stopping.
Reverse Movement
A movement opposite the authorized direction.
Siding
A track connected to the main track and used for meeting or passing trains. Locations of sidings
are shown int he Timetable.
Special Instructions
Instructions contained in the Timetable or other publications.
, Station
A place designated by name in the Timetable station column.
Track Bulletin
A notice of coinditions affecting train movement. It may also authorize movement against the
current of traffic where rule 9.14 (movement witht he Current of Traffic) is in effect.
Track Car
Any equipment which is designed to operate on the rail, other than a Locomotive or railroad car.
Track Warrant Control (TWC)
A method to authorize train movements or protect man or machines on a main track within
specified limits in a territory designated by the timeline.
Train
One or more engines coupled, with or without cars, displaying a marker, and authorized to
operate ont he main track.
Yard Limit
A portion of main track designated by yard limit signs and time table special instructions or a
track bulletin.
Any employee operating a radio must do the following
Before transmitting, listen long enough to make sure the channel is not being used. Give the
required identification. Not proceed with further transmission until acknowledgement is
received.
For Mobile Units
Name or initials of the railroad
Train name(number), enginenumber, or words that identify the precise mobile unit.
Ending Radio Transmissions - "Over"
When a response is expected
Ending Radio Transmissions - "OUT"
Preceded by required identification when NO RESPONSE is expected.
Watch or Clock
RATED A+ 2026 | NEW
Dual Control Switch
A power operated switch, movable point frog, or derail that can also be operated by hand.
Electric Switch Lock
An electrically controlled lock that restricts the use of a hand operated switch or derail.
Absolute Signal
A block or interlocking signal without a number plate or designated by an A marker.
Automatic Block System (ABS)
A series of consecutive blocks governed by block signals, cab signals, or both. The signals are
activated by a train or by certain conditions that affect the block use.
Block
A length of track between consecutive block signals or between a block signal and the end of
block system limits.
Centralized Traffic Control (CTC)
A block system that uses block signal indications to authorize train movements.
Control Operator
An employee assigned to operate a CTC or interlocking control machine or authorized to grant
track permits.
Control Point
The location of absolute signals controlled by a central operator or a railroad identifiable point
as defined in the Timetable.
Controlled Siding
A siding within CTC and Interlocking limits where a signal indication authorizes the siding's use.
Controlled Signal
An absolute signal controlled by a control operator.
,Controlled Track
Track upon which the railroad's operating rules require that all movements of trains must be
authorized by a train dispatcher or a control operator.
Crossover
A combination of two switches that connect two adjacent tracks.
Interlocking Signals
The fixed signals of an interlocking that govern trains using interlocking limits.
Loaded Bulk Commodity Train
Loaded Unit Trains are defined as a train of 50 or more loaded cars in a block, each weighing
125 tons gross weight or more (bulk commodities), such as coal, grain, soda ash, etc.
Main Track
A track extending through yards and between stations that must be occupied without authority
or protection.
Non-Controlled Track
Track upon which trains are permitted by railroad rule or special instruction to move without
recieving authorization from train dispatcher or control operator.
Off-Track Equipment
Machines that may be operated on the right of way foul of track.
Proceed Indication
Any block signal indication that allows a train to proceed without stopping.
Reverse Movement
A movement opposite the authorized direction.
Siding
A track connected to the main track and used for meeting or passing trains. Locations of sidings
are shown int he Timetable.
Special Instructions
Instructions contained in the Timetable or other publications.
, Station
A place designated by name in the Timetable station column.
Track Bulletin
A notice of coinditions affecting train movement. It may also authorize movement against the
current of traffic where rule 9.14 (movement witht he Current of Traffic) is in effect.
Track Car
Any equipment which is designed to operate on the rail, other than a Locomotive or railroad car.
Track Warrant Control (TWC)
A method to authorize train movements or protect man or machines on a main track within
specified limits in a territory designated by the timeline.
Train
One or more engines coupled, with or without cars, displaying a marker, and authorized to
operate ont he main track.
Yard Limit
A portion of main track designated by yard limit signs and time table special instructions or a
track bulletin.
Any employee operating a radio must do the following
Before transmitting, listen long enough to make sure the channel is not being used. Give the
required identification. Not proceed with further transmission until acknowledgement is
received.
For Mobile Units
Name or initials of the railroad
Train name(number), enginenumber, or words that identify the precise mobile unit.
Ending Radio Transmissions - "Over"
When a response is expected
Ending Radio Transmissions - "OUT"
Preceded by required identification when NO RESPONSE is expected.
Watch or Clock
