In what situation would a locomotive engineer perform a 'walk-around inspection'?

A walk-around inspection is a crucial safety procedure for a locomotive engineer to ensure that the train is in a safe operating condition before it departs. This inspection typically involves checking various components of the locomotive and train cars, such as brakes, wheels, lights, and any visible signs of wear or malfunction.

By conducting this inspection before departure, the engineer ensures that all systems are functioning properly and identifies any potential issues that need to be addressed, thus enhancing the safety of both the crew and passengers. This proactive approach helps prevent accidents related to equipment failures during operation.

The context for other options highlights scenarios where a walk-around inspection is either not necessary or not permissible due to safety protocols. For instance, inspecting the train after it has derailed may not be practical or safe, and performing such an inspection during a scheduled rest period would violate guidelines intended to ensure that engineers are alert and focused when conducting their duties. Additionally, inspecting right before the train reaches a station may not provide an opportunity to correct any issues that are discovered, unlike a pre-departure inspection that allows time for necessary adjustments.