The engineer must acknowledge all radio communication from the conductor during shoving movements when the distance is more than how many cars?

• A. More than 4 cars
• B. More than 2 cars
• C. More than 6 cars
• D. More than 8 cars

Answer: (A)

During shoving moves, safety hinges on clear, confirmed communication between the conductor and engineer. When the locomotive is more than four cars away from the shove, the engineer must acknowledge every radio message from the conductor. This threshold matters because at that distance you can’t rely on eye contact or close-range signals alone, so you need an explicit acknowledgment to confirm you heard and understood the instruction—whether it’s to stop, brake, or adjust speed. This practice helps prevent miscommunication that could lead to unsafe movements or derailments. If you’re within four cars, closer coordination and signals often suffice, but beyond that range, acknowledgment becomes essential to keep the maneuver safe.