Grand Scales General Code of Operating Rules – First Edition – January 1, 2007
Occupying Same Track Warrant Limits 16.4 A track warrant must not be issued to a train within the same or overlapping limits with another train unless:
In signaled territory, all trains are authorized to proceed in the same direction.
In non-signaled territory, all trains are authorized to proceed in the same
direction and are instructed to move at restricted speed.
Two or more trains are authorized to “work between” two specific points at
restricted speed within the overlapping limits.
Trains are authorized to proceed through the limits of another train authorized
to “work between” two specific points, and track warrants instruct all trains to move at restricted speed within the shared limits.
Radio Blocking 16.5 Where designated by special instructions, in non-signaled territory, more than one train may be authorized to proceed in the same direction within the same or overlapping limits, provided the following train:
is notified on the track authority of the identity of the preceding train.
does not occupy the limits ahead of the preceding train.
notifies the crew of the preceding train that radio blocking has been authorized
stating the limits.
is notified by the preceding train that the entire train has passed a specific
location. Location specified must not be beyond limits indicated. The following words must be used: “(train) clear of (location).”
does not proceed beyond the last location the preceding train has reported to have
All instructions between the trains must be repeated by the receiver and acknowledged with “That is Correct” by the sender before being acted upon. These written instructions between the trains must be retained until the end of tour of duty.
Notify the train dispatcher if communication cannot be established between the two trains. If necessary, radio blocking information may be relayed only by the train dispatcher.
The last named point of the following train’s authority must not extend beyond the last named point of the preceding train’s authority.
In the application of Rule ? (Reverse Movements) and Rule ? (Picking up Crewmember), the movement must not go beyond the last specific location reported to the following train.