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Questions and Answers
What is the purpose of an Interlocking Appliance?
What is the purpose of an Interlocking Appliance?
- To secure tracks for maintenance work
- To control movements over designated routes (correct)
- To transmit unique random numbers to RWICs
- To indicate the limit of a block under MBS rules
When is an interlocking appliance considered blocked?
When is an interlocking appliance considered blocked?
- When a qualified employee secures it
- When a BDR code is transmitted
- When a fixed signal is displayed
- When an approved device prevents its operation (correct)
What defines the Interlocking Limits?
What defines the Interlocking Limits?
- The number of movable apparatus within an interlocking
- The unique random numbers transmitted
- The tracks between the extreme opposing signals (correct)
- The speed displayed on a CAB signal
What does a Controlled Signal do?
What does a Controlled Signal do?
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How is an interlocking appliance considered secured?
How is an interlocking appliance considered secured?
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What does a Signals Block Limit Signal indicate?
What does a Signals Block Limit Signal indicate?
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Study Notes
Blocking Device Removed (BDR) Code
- Unique, random number generated by Operations Control Center (OCC) to Roadway Worker-in-Charge (RWIC) before fouling a track or starting work under CTC or Interlocking Rules
Interlocking and Interlocking Appliances
- Interlocking: arrangement of signals and appliances that must follow a specific sequence
- Interlocking Appliance: movable apparatus that allows or prevents movements over designated routes, including switches, movable frogs, mitre rails, and derails
- Blocking an Interlocking Appliance: applying an approved device to the control console to prevent operation
- Securing an Interlocking Appliance: applying an approved device to prevent operation, or electrically disabling and mechanically locking the appliance in the required position
Interlocking Limits and Signals
- Interlocking Limits: tracks between the extreme opposing signals of an interlocking
- Signal Block Limit Signal: fixed signal indicating the limit of a block under Manual Block System (MBS) rules
- Cab Signal: signal in the engine control compartment indicating a permissible speed
- Controlled Signal: fixed signal capable of displaying a Stop indication, controlled by the Rail Traffic Controller (RTC)
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