What is indicated by three short blasts on the train whistle?

Three short blasts on the train whistle specifically indicate that a road car inspector is being called. This sounds a signal that is recognized in many railroads as a way to communicate the need for inspection services before a train proceeds. Whistle signals are a critical component of operational communication, ensuring that important messages can be conveyed effectively, particularly in situations that require quick understanding among crew members and personnel on the ground.

For instance, when a train approaches an area where inspection is necessary, the sound of three short blasts alerts the designated inspector of the train's presence and readiness for the inspection process, enhancing safety and operational efficiency. Understanding these signals is vital for train operators to ensure compliance with safety protocols and operational procedures.