What is the standard protocol upon encountering a stop signal?

The standard protocol upon encountering a stop signal is to bring the train to a complete stop. This is crucial for ensuring safety on the railways, as a stop signal indicates that the train must halt before proceeding. Stop signals are typically used to control train movement, indicating that there may be potential hazards ahead, such as another train on the same track, track work, or other operational restrictions.

Bringing the train to a complete stop allows the locomotive engineer to assess the situation ahead, communicate with dispatch if necessary, and determine the appropriate course of action. Safety is the utmost priority in train operations, and following the stop signal is a foundational rule that helps prevent accidents and ensure the safety of passengers, crew, and any rail workers in the vicinity.