If the person disappears who is giving the signal to back or shove a train, engine, or car, or the light being used disappears, employees must:

• A. Stop within half the specified distance, unless able to make radio contact
• B. Stop immediately
• C. Continue with caution
• D. Notify supervisor and continue

Answer: (A)

When signal guidance is lost, safety relies on a built‑in stopping margin. If the person giving the back or shove signal, or the signaling light they use, disappears, you must stop within half the stopping distance unless you can re‑establish radio contact to coordinate with supervision. This creates a safety buffer to prevent a movement from continuing into an uncertain situation or toward a potential hazard. If radio contact can be made, you may proceed under those instructions; without contact, the safer default is to halt early. Stopping immediately or continuing without that safety step doesn’t align with the required precaution and increases risk.