Union Pacific -- Railroading Basics (GCOR) Exam Questions with and
Answers with Verified Solutions | Latest 2026 Update
Q: Automatic Cab Signal System (ACS) A system that allows cab signals and the
cab warning
Answer:
whistle to operate automatically.
Automatic Train Control (ATC) A system to enforce compliance with cab signal
indications. If
the train exceeds a predetermined speed for a given cab signal indication and speed is
not
reduced at a sufficient rate, brakes are automatically applied.
Absolute Block A length of track that no train is permitted to enter while the track is
occupied by another train.
Special Instructions Instructions contained in the timetable or other publication.
Timetable A publication with instructions on train, engine, or equipment movement.
It also
contains other essential information.
Breach To enter an area between two adjacent tracks.
, Q: Cab Red Zone A "Cab Red Zone" (CRZ) exists during critical times or when
multiple tasks are
Answer:
occurring. During a Cab Red Zone, an environment must be created in the
locomotive control
compartment that focuses exclusively on controlling the train, verbally
communicating
restrictions, and proper application of the rules. *Passing a signal that causes train to
stop at
next signal will establish CRZ.*
SSI *System Special Instructions;* Allows for rule modifications/changes to General
Code of
Operating Rules, Air Brake and Train Handling Rules, and Safety Rules.
Adjacent Track Parallel tracks that are not separated by a single lane roadway or
similar
distance are considered adjacent tracks.
This definition only applies when determining if Track Breach Protection is
required.*
Proceed Indication Any block signal indication that allows a train to proceed without
stopping.
Stowed When required by rule 2.21, electronic devices including cell phones,
laptops,
cameras, DVD's, etc., must be turned off and placed out of sight in the employee's
grip,
luggage, back pack, etc. Electronic devices placed in pockets or device holsters are
not
considered as being stowed.
Electronic Device An electronic or electrical device used to conduct oral, written, or
visual
communication; place or receive a telephone call; send or read an electronic mail
message or
text message; look at pictures; read a book or other written material; play a game;
Answers with Verified Solutions | Latest 2026 Update
Q: Automatic Cab Signal System (ACS) A system that allows cab signals and the
cab warning
Answer:
whistle to operate automatically.
Automatic Train Control (ATC) A system to enforce compliance with cab signal
indications. If
the train exceeds a predetermined speed for a given cab signal indication and speed is
not
reduced at a sufficient rate, brakes are automatically applied.
Absolute Block A length of track that no train is permitted to enter while the track is
occupied by another train.
Special Instructions Instructions contained in the timetable or other publication.
Timetable A publication with instructions on train, engine, or equipment movement.
It also
contains other essential information.
Breach To enter an area between two adjacent tracks.
, Q: Cab Red Zone A "Cab Red Zone" (CRZ) exists during critical times or when
multiple tasks are
Answer:
occurring. During a Cab Red Zone, an environment must be created in the
locomotive control
compartment that focuses exclusively on controlling the train, verbally
communicating
restrictions, and proper application of the rules. *Passing a signal that causes train to
stop at
next signal will establish CRZ.*
SSI *System Special Instructions;* Allows for rule modifications/changes to General
Code of
Operating Rules, Air Brake and Train Handling Rules, and Safety Rules.
Adjacent Track Parallel tracks that are not separated by a single lane roadway or
similar
distance are considered adjacent tracks.
This definition only applies when determining if Track Breach Protection is
required.*
Proceed Indication Any block signal indication that allows a train to proceed without
stopping.
Stowed When required by rule 2.21, electronic devices including cell phones,
laptops,
cameras, DVD's, etc., must be turned off and placed out of sight in the employee's
grip,
luggage, back pack, etc. Electronic devices placed in pockets or device holsters are
not
considered as being stowed.
Electronic Device An electronic or electrical device used to conduct oral, written, or
visual
communication; place or receive a telephone call; send or read an electronic mail
message or
text message; look at pictures; read a book or other written material; play a game;
