In Rule 251 Territory, must not make a reverse movement beyond the limits of the block without:

• A. Form D line 2 authority
• B. Verbal permission of the dispatcher
• C. Written permit from supervisor
• D. A proceed indication

Answer: (A)

In Rule 251 Territory, moving in reverse beyond the limits of the block requires formal authority documented on Form D line 2. This written dispatcher instruction is the official way to authorize a movement that isn’t covered by the normal block limits, ensuring everyone knows where the train is and what it’s permitted to do. It helps prevent conflicts with other trains and with track personnel by providing a clear, recorded authorization for the reverse movement beyond the block.

Verbal permission isn’t sufficient because it’s not a reliable, track-wide record that can be referenced later. A written permit from a supervisor isn’t the standard mechanism for this particular movement, and a proceed indication alone is not designed to authorize moving beyond block limits. The Form D line 2 authority is the proper control for this scenario.