Definitions Flashcards
What is the definition of an Automatic Block Signal System?
A series of consecutive block governed by block signals, cab signals, or both. The signals are activated by a train or by certain conditions that affect block use.
What is the definition of an Absolute Signal?
A block or interlocking signal without a number plate or designated by an “A” marker.
What is the definition of a Block?
- A length of track between consecutive block signals
- Between a block signal and the end of a block system limits,
- Or in ATC limits the use of which is governed by cab signals and/or block signals.
What is the definition of a Block Signal?
A fixed signal at the entrance of a block that governs trains entering and using that block.
What is the definition of a Block System?
A block or series of consecutive blocks within ABS, ACS, CTC, or interlocking limits.
What is the definition of Centralized Traffic Control (CTC)?
A block system that uses block signal indications to authorize train movements.
What is the definition of a Control Point?
The location of Absolute Signals controlled by a Control Operator.
What is the definition of Current of Traffic?
The movement of trains in one directions on a Main Track, as specified by the rules.
What is the definition of Double Track?
Two Main Tracks where the current of traffic on one track is in a specific direction, and in the opposite direction on the other.
What is a General Track Bulletin (GTB)?
A notice containing Track Bulletin restrictions, and other conditions affecting track movements.
What is the definition of an Interlocking?
Signal appliances that are interconnected so that each of their movements follows the other in proper sequence. Interlockings may be operated manually or automatically.
What is the definition of Main Track?
A track extending through Yards and between Stations that must not be occupied without authority or protection.
What is the definition of Multiple Main Track?
Two or more Main Tracks that are used according to the Timetable.
What is the definition of a Proceed Indication?
Any block signal indication that allows a train to proceed without stopping.
What is the definition of a Train?
One or more engines coupled, with or without cars, displaying a marker, and authorized to operate on the Main Track. A term that used in connection with speed restrictions, flag protection and the observance of all signals and signal rules, also applies to engines.
