The diagnostic display indicates GROUND RELAY LOCKOUT. What effect does this have on the diesel engine?

The diagnostic display indicates GROUND RELAY LOCKOUT. What effect does this have on the diesel engine?

• A. An alarm will sound and the locomotive will no longer load
• B. The engine will automatically shut down completely
• C. The horn will emit a warning tone
• D. The cab lights will flash warning indicators

Answer: (A)

Ground relay lockout is a protective interlock in the locomotive’s electrical system that prevents applying traction power when a fault is detected. When this condition occurs, an alarm is triggered and the locomotive cannot load, meaning it won’t draw power to the traction motors even if the throttle is advanced. This keeps the propulsion system from operating under unsafe conditions while the fault is addressed. It doesn’t automatically shut the engine down, and it’s not about the horn or cab lights flashing.

Ground relay lockout is a protective interlock in the locomotive’s electrical system that prevents applying traction power when a fault is detected. When this condition occurs, an alarm is triggered and the locomotive cannot load, meaning it won’t draw power to the traction motors even if the throttle is advanced. This keeps the propulsion system from operating under unsafe conditions while the fault is addressed. It doesn’t automatically shut the engine down, and it’s not about the horn or cab lights flashing.