What is the first step a train dispatcher must take when handling a train that has overridden a stop signal?

When a train dispatcher is handling a situation where a train has overridden a stop signal, the first step to take is to stop the train and hold it for further instructions. This action is critical because overriding a stop signal indicates a potentially dangerous situation; the train may be on a collision course or in an unsafe position. By stopping the train, the dispatcher prevents any further risk until the situation can be assessed and resolved.

Holding the train allows the dispatcher to gather information, notify the necessary personnel, and coordinate the appropriate response to ensure safety. It serves as a precautionary measure, ensuring that no actions are taken that could exacerbate the situation. Once the train is stopped, further decisions can be made based on the specifics of the situation, such as whether to allow movement under caution, communicate with the train crew, or alert other dispatchers and supervisors. This systematic approach prioritizes safety in a critical moment.