What action should a train engineer take if the train length cannot be confirmed?

When a train engineer cannot confirm the train length, the appropriate action is to inform station control. This step is crucial because station control has the responsibility to coordinate train movements and ensure safety on the rail network. By notifying them, the engineer allows for a better assessment of the situation and ensures that any necessary precautions can be taken to manage train spacing and overall safety.

This action also helps in addressing potential risks associated with unverified train lengths, such as ensuring that the train will fit on platforms or in block sections safely. Keeping communication open with station control is essential for operational efficiency and safety standards, as they can provide guidance on how to proceed based on the information available.