If the cab signal apparatus is de-energized after the departure test has been made, it must be?

If the cab signal apparatus is de-energized after the departure test has been made, it must be?

• A. Tested again before entering equipped territory.
• B. Remains de-energized and may be used immediately.
• C. Be replaced with a new unit before use.
• D. Not tested again for the current trip.

Answer: (A)

After power to the cab signaling equipment has been removed and you’ve completed the departure test, you must re-test before entering territory that is equipped with cab signals. Re-testing ensures the system is functioning correctly once power is restored and will display the proper indications for the upcoming track. This prevents relying on a system that could have faulted or reset during the de-energization. Using the cab signal immediately, or not testing again at all, could lead to unsafe operation if the indications are wrong. Replacing the unit isn't the standard requirement simply because power was removed; the priority is to verify proper operation first.

After power to the cab signaling equipment has been removed and you’ve completed the departure test, you must re-test before entering territory that is equipped with cab signals. Re-testing ensures the system is functioning correctly once power is restored and will display the proper indications for the upcoming track. This prevents relying on a system that could have faulted or reset during the de-energization.

Using the cab signal immediately, or not testing again at all, could lead to unsafe operation if the indications are wrong. Replacing the unit isn't the standard requirement simply because power was removed; the priority is to verify proper operation first.