Employees must not use the radio to give information to a train or engine crew about the name, position, aspect or indication displayed by a fixed signal, unless:

• A. The information is given between members of the same crew or the information is needed to warn of an emergency
• B. The information is posted on a public board
• C. The information is released by management
• D. The information is announced over a loudspeaker

Answer: (A)

Communications about fixed signal details must stay within a controlled circle to prevent misinterpretation that could lead to unsafe actions. The only permissible radio use is when the information is shared directly between members of the same crew who need to coordinate at that location, or when it’s necessary to warn of an emergency. This keeps critical signal information within a tightly defined group and allows rapid, unambiguous action in urgent situations.

Sending this information to a broader audience—posting on a public board, having management release it, or announcing it over a loudspeaker—introduces channels and audiences that aren’t authorized for real-time signal detail, which can cause confusion, delay proper responses, or violate procedures.