What does the ADCL light indicate on PA5 cars?

The ADCL light specifically indicates the status of the automatic door control system on PA5 cars. It serves as a crucial indicator for the train engineer, showing whether the system is functioning correctly. When the ADCL light is illuminated, it conveys important operational information to the engineer regarding door status and functionality.

In contrast to other options, none of them accurately describe the purpose of the ADCL light. The correct option reflects a clear understanding of the function of control indicators related to the operation of PA5 trains, emphasizing the significance of the door control system as part of safety and operational protocols in train management. Understanding this can help engineers ensure that all systems are operational before and during service.