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    605. At locations designated by special instructions, interlocking signals govern the use of the blocks and routes of an interlocking, and as to movements within interlocking limits, their indications supersede the superiority of trains.

    605-A. Trains or engines must not enter or foul the main track or other signalled track where these rules are in effect nor cross over from one such track to another, except as governed by signal idication or on permission of the Train Dispatcher, obtained by the Conductor or Engineer.

    Permission of the Train Dispatcher to hand-operate a switch to enter main track, or other signalled track, does not relieve employe of compliance with Rule 505 unless interlocking signal is provided to govern movement.

    Switching movements against the current of traffic beyond interlocking limits must not be made without permission of the Train Dispatcher and then only under flag protection or train order.

Automatic Block Signal System Rules

Emergency Signals