Answers
Interlocking - Answer-arrangement of signals and appliance so interconnected that their
movements must succeed each other in proper sequence and for which interlocking
rules are in effect
interlocking appliance - Answer-moveable apparatus within in an interlocking that either
prevents or allows movements over designated routes
examples: movable frogs, metre rails, derails and switches
Blocked Interlocking appliance - Answer-approved device applied to the control console
that prevents the control for that appliance from being operated
Secured Interlocking device - Answer-qualified employee applies device to the
appliance that prevents it from being operated.
electrically disable and mechanically locks it into position
Interlocking Limits - Answer-The tracks between the extreme opposing signals of an
interlocking.
Block Limit Signal - Answer-a fixed signal indicating the limit of a block under MBS
(manual block system) rules
Cab Signals - Answer-signal locked in engine control compartment indicating
permissible speed
Controlled Signal - Answer-fixed signal
displaying a stop indication
- Controlled by RTC
Distant Signal - Answer-a fixed signal used to govern the approach to an interlocking
signal
Indication - Answer-information conveyed by the aspect of a signal
Interlocking Signal - Answer-Fixed signals of an interlocking
Maximum Authorized Speed (MAS) - Answer-max speed authorized by the operating
rules and special instructions
Limited Speed - Answer-not exceeding 45 MPH for passenger and 25 MPH for other