What is the proper whistle signal for approaching workmen?

The proper whistle signal for approaching workmen is two long blasts followed by one short blast and then another long blast. This signal is critical as it serves as a warning to individuals who may be near the tracks that a train is approaching, ensuring their safety. The two long blasts indicate that the train is coming through a potentially hazardous area, providing ample notice for workmen to be aware of their surroundings. The added short and long blasts further clarify that caution is required and that the engineer is actively signaling the presence of the train.

This signaling protocol is established to ensure clear communication in railroad operations, especially in situations where visibility may be compromised due to work conditions or other hazards. Understanding and appropriately responding to such signals is vital for the safety of all personnel on or near the tracks.