What are short sounds on the engine whistle used for?

Short sounds on the engine whistle are primarily used for warning when approaching people or animals. This practice ensures safety by alerting individuals in the vicinity of the train's approach, allowing them time to move away from the tracks or take necessary precautions. It's a critical aspect of operational safety, as it helps prevent accidents and ensures that the area is clear of obstructions before the train passes through.

The use of short whistle signals is standardized in various operating protocols to maintain consistency and effectiveness in communication between the train crew and individuals who might be in the train's path. This aspect of railway operations is crucial for avoiding potential collisions or injuries.