What might a crew use if needing to communicate urgent instructions to proceed past a block signal?

A crew may use a train order or verbal communication under Part 241 to convey urgent instructions for proceeding past a block signal. This method is established within railroad operations to ensure that instructions are clearly understood and safely executed, adhering to established protocols.

Train orders are written directives that provide commands or information to train crews, ensuring that necessary precautions are followed when operating under special circumstances. Verbal communication, specifically under the regulations of Part 241, allows for immediate and direct communication that can be vital in urgent situations, ensuring that both parties are aligned on the actions to be taken.

While other options might involve some form of communication, they may not comply with the formal standards required in critical scenarios. For instance, text messages may not be reliable or secure enough for urgent communication in a railroad environment. Emergency radio calls are typically used for different types of urgent situations that may arise but aren't specifically for the purpose of passing signals. Visual signals from ground crew, while useful for communication, might not always be clear or immediate as a train order or verbal instructions, especially in complex scenarios requiring strict adherence to safety protocols.