What indicates that a cab is active in a Siemens train?

The indication that a cab is active in a Siemens train is confirmed by the illumination of the cab active light. This light serves as a direct and specific signal to the train operator that the cab has been successfully activated and is ready for operation. It provides a clear visual cue, removing ambiguity about the status of the cab.

While other indicators such as flashing lights or alarms may provide alerts about various system statuses, they do not specifically confirm the activation of the cab. A loss of communication with the control system represents a fault condition rather than an operational state of the cab. Therefore, the cab active light is the most definitive and relevant signal for determining whether the cab is active, ensuring the train operator can proceed with confidence.