If communication fails before a Form D has been given a Time Effective trains addressed, what action must be taken?

• A. Proceed with caution under dispatcher's instruction.
• B. Must not proceed nor be given permission to proceed until communication has been reestablished.
• C. Continue operation using the previous authority.
• D. Request a new Form D via radio backup.

Answer: (B)

The main idea is that movement relies on a valid Form D, a time‑effective train order issued by the dispatcher. If radio or other communication fails before that Form D has been issued, there is no authority in effect to move. Therefore the train must not proceed and cannot be given permission to proceed until communication is reestablished. This prevents trains from advancing under uncertain or incomplete instructions. Once communication is restored, the dispatcher can issue the Form D or authorize movement properly, and operations can resume. Proposing movement under an assumed instruction or relying on any previous authority isn’t appropriate, and requesting a new Form D over the radio isn’t possible until comms are back, so restoration of communication comes first.