Controlled Electric Lock and CTC Interlocking Understanding Railroad Signals - Part 14

摘要

Controlled electric locks operate similarly to automatic electric locks except that the dispatcher is required to take physical action to send a "control request" to the field circuitry to release and restore the lock. This request is in addition to all the actions that the train crew needs to take, which are identical to those required with an automatic electric lock as covered in Part 13 in the February 2017 issue. From the train crew's perspective, it typically goes unnoticed whether or not the hand-operated switch is functioning with an auto- matic or a controlled electric lock.