What action is required when the axle count exceeds the known number?

When the axle count exceeds the known number, it is essential to continue movement and inform the train dispatcher. This action allows for real-time communication regarding the situation, ensuring that the train dispatcher can manage the safety implications and take appropriate measures based on the train's location and the potential issues at hand.

Continuing movement can be important to avoid disrupting rail traffic while simultaneously making sure that safety protocols are upheld. The dispatcher can then coordinate with maintenance crews or other relevant personnel to respond appropriately, which might include preparing inspection teams or arranging for any necessary interventions once the train is stationary.

The other options, while they may seem reasonable, do not align with the procedural requirements for handling this specific situation. Stopping the train or diverting to a maintenance yard may not be as efficient or necessary at that moment without further assessment and coordination with the dispatcher.