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Union Pacific – GCOR Main Track Operations – Complete Q&A Guide to Track Authorization, Movement Rules, and Signal Procedures

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This document offers a detailed and accurately answered question set on Union Pacific’s General Code of Operating Rules (GCOR) specific to main track operations. It covers critical rules on main track authorization, emergency stops, reverse movements, signal protocols, interlocking, restricted and yard limits, and special safety procedures such as track breach and block system suspensions. Ideal for engineers, conductors, or anyone preparing for GCOR certification.

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Institution
BNSF Roadway Worker Protection
Course
BNSF roadway worker protection

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GCOR -- Main Track Operations questions with
accurate answers
(Main Track Authorization)
*Joint Authority* Ans✓✓✓ When a train or employee receives
authority joint with an employee(s), the train or employee must not
occupy the overlapping limits until:
(1.) Working limits are described and permission is received to enter the
overlapping limits from the employee(s) listed on the authority
(2.) Advice is received from the train dispatcher or control operator that
the employee(s) have reported clear of the limits.


When a train receives joint authority, movements must be made at
*restricted speed.*
(Rule 6.3)


Actuating Automatic Warning Devices Unnecessarily Ans✓✓✓ Avoid
actuating automatic warning devices unnecessarily by leaving switches
open or permitting equipment to stand within the controlling circuit.
(Rule 6.32.5)


Approach to Automatic Interlocking
*(Signaled)* Ans✓✓✓ A train must proceed prepared to stop at the
interlocking signal when:
*1.) Moving below 25 MPH* and passing a signal that governs the
approach to an automatic interlocking.

, *2.)* Speed is *reduced to below 25 MPH* after passing a signal that
governs the approach to an automatic interlocking.


Train must *continue prepared to stop* at the interlocking signal until
the train *reaches a point 1000 feet from signal*. If signal indicates
*Proceed*, train may resume speed.


Authority to Enter CTC Limits Ans✓✓✓ CTC limits are designated in
the timetable. Sidings within CTC limits are controlled sidings and are
governed by CTC rules. A train must not enter or occupy any track
where CTC is in effect unless a *controlled signal displays a proceed
indication* or the *control operator authorizes*. (Rule 10.1)


Authority to Enter TWC Limits Ans✓✓✓ Where designated by the
timetable, a *track warrant will authorize main track use* under the
direction of the train dispatcher or as prescribed by Rule 6.13 (Yard
Limits) or 6.14 (Restricted Limits). Track warrant instructions must be
followed where yard limits or restricted limits are in effect. (Rule 14.1)


Automatic Warning Devices and Crossings That Require Additional
Precautions Ans✓✓✓ A movement must not foul a crossing equipped
with automatic warning devices until the device has been operating long
enough to provide warning and the crossing gates, if equipped, are fully
lowered. Report all defects of crossings immediately to dispatch or to
Grade Crossing Safety Hot Line. Notify all affected trains ASAP. (Rule
6.32.2)

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Institution
BNSF roadway worker protection
Course
BNSF roadway worker protection

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Uploaded on
August 1, 2025
Number of pages
13
Written in
2025/2026
Type
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Questions & answers

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