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Automatic Block Signal System (ABS)
A block signal system in which the use of each block is governed by an automatic
block signal, cab signal, or both
Return Movement
The movement of an uncoupled engine (or engines) or leading portion of a
train, directed back toward the remaining stationary portion of the same train
Distant Signal
A fixed signal used to govern the approach to a home signal
Home Signal
A signal that governs the entrance to an interlocking
Main Track
The name of a track that is designated by timetable upon which movements
authorized by ABS, DCS, or interlocking rules
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Bulletin Order (BO)
A publication used to notify employees of the movement of trains. Bulletin Orders
are issued periodically by the designated officer
General Order
A publication used to summarize changes to the timetable and other instructions
Division Notice (DN)
A publication issued periodically which contains instructions or information
which do not affect the movement of trains
Slow Speed
Not exceeding 15 MPH
Medium Speed
Not exceeding 30 MPH
Limited Speed
Not exceeding 45 mph (40 mph for freight)
Term used for Maximum Authorized Speed
Normal Speed
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How do you know what lines are applicable to you on a Form D?
They are circled
What is a line 2 on a Form D?
Movement authority against the current of traffic or in DCS territory
What is a line 4 on a Form D?
Takes tracks out of service
What is a line 5 on a Form D?
Establishes the limits of working limits (rule 135)
What is a line 6 on a Form D?
Put DCS rules in effect
What is a line 7 on a Form D?
Takes interlockings and CP signals out of service
What are lines 8 & i in a Form D?
Used to rescue disabled trains
8- Disabled train
9- Rescue of the train
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