If an express train operator discovers that their indication light is out while in motion, what should they do first according to regulation?

When an express train operator notices that their indication light is out while the train is in motion, the appropriate first action is to bring the train to a stop. This decision is crucial for ensuring the safety of the train, its passengers, and the railway system as a whole. An indication light serves as an essential safety device that provides vital information regarding the operational status of the train. If this light is not functioning, it may signal a malfunction or another issue that requires immediate attention.

Stopping the train allows the operator to assess the situation carefully without further endangering the train's safety or the safety of others. It also provides the operator an opportunity to communicate with central dispatch or inspect the control panel for any further issues while ensuring that the train remains in a secure state.

While options such as checking the control panel or contacting central dispatch are important parts of troubleshooting in the event of a malfunction, these steps follow the immediate necessity to stop the train when a critical indicator fails. Increasing speed is not advisable in any situation where there is uncertainty about the train’s operational status. Overall, prioritizing safety through prompt action is critical in any train operation, making the decision to stop the train the correct first step in this scenario.