When the cab signals are cut out on the DP remote locomotive’s integrated display and the circuit breaker is open, what is the proper configuration for the cab signal switches on the DP remote locomotive?

When the cab signals are cut out on the DP remote locomotive’s integrated display and the circuit breaker is open, what is the proper configuration for the cab signal switches on the DP remote locomotive?

• A. Cut-out Cab Signals using switches in screen. Cab Signal circuit breaker (back wall) must remain on.
• B. Cab Signals must be cut-in and the circuit breaker on
• C. Cut-out Cab Signals using screen; Cab Signal circuit breaker off
• D. Cab Signals on; circuit breaker ignored

Answer: (A)

The key idea is to handle cab signaling through the DP remote’s display controls while keeping the signaling hardware powered. When cab signals are cut out on the integrated display, you disable or cut out the cab signals using the on-screen switches, and you leave the Cab Signal circuit breaker on (powered). Keeping the breaker on ensures the signaling hardware remains supplied and avoids creating ambiguous or unsafe conditions, even though the display is not presenting cab signal information. Re-enabling cab signals or turning the circuit breaker off would either defeat the cut-out, causing signals to be active again, or remove power from signaling-related circuitry, which can compromise safety.

The key idea is to handle cab signaling through the DP remote’s display controls while keeping the signaling hardware powered. When cab signals are cut out on the integrated display, you disable or cut out the cab signals using the on-screen switches, and you leave the Cab Signal circuit breaker on (powered). Keeping the breaker on ensures the signaling hardware remains supplied and avoids creating ambiguous or unsafe conditions, even though the display is not presenting cab signal information. Re-enabling cab signals or turning the circuit breaker off would either defeat the cut-out, causing signals to be active again, or remove power from signaling-related circuitry, which can compromise safety.