The information about a fixed signal may be shared over the radio only under which condition?

• A. Only when the signal is green
• B. The information is given between members of the same crew or the information is needed to warn of an emergency
• C. Only when the signal is malfunctioning
• D. Only when the information is posted publicly

Answer: (B)

Communicating fixed-signal information over the radio is restricted to those who actually need it to operate safely. The rule is that this information can be shared within the same crew, so everyone on the train has the necessary instructions, and it can be shared to warn others if there’s an emergency. This keeps the information targeted, reduces the chance of confusion, and avoids exposing sensitive signaling details to people who don’t need them.

Other scenarios don’t fit because sharing with people outside the crew or publicly would clutter lines of communication and could lead to miscommunication or safety risks. Likewise, limiting sharing only to times when a signal is green or only when a signal is malfunctioning doesn’t align with the safety need to promptly inform crew members and, in emergencies, warn others as needed.