What does a propulsion fault light indicate?

The propulsion fault light is an important indicator for the train operator, as it reflects critical information about the train's performance. When this light is illuminated, it signifies that there has been an automatic disconnection of the propulsion system. This automatic response is designed to ensure safety and prevent further issues or damage to the system, often as a result of a fault detected in the propulsion mechanism. In this context, option B serves to inform the operator that the train is not currently in a position to be driven or propelled until the issue is addressed.

The other options do not accurately capture the specific function of the propulsion fault light. While a malfunctioning car might lead to the propulsion system disconnecting, the light specifically indicates the disconnection rather than a general malfunction. Engaged emergency brakes are indicated by different signals or lights and do not directly relate to the propulsion system status. Normal operations would indicate that everything is functioning correctly, which would not trigger a propulsion fault light. The clarity in understanding the purpose of this light is crucial for appropriate responses and maintaining operational safety on the train.