Final answer:
If the train whistle or horn becomes inoperative en route, the train operator must take appropriate action to ensure safety and may use alternative methods to communicate and indicate the presence of the train.
Step-by-step explanation:
If the train whistle or horn becomes inoperative en route and the problem cannot be corrected, the train operator must take appropriate action to ensure the safety of passengers and other personnel. This may involve using alternative methods to communicate with those on board and alerting people at crossings manually.
Train operators often have a specific set of protocols to follow in the event of equipment failure. These protocols can vary depending on the specific train company and regulations of the area. Some possible actions that train operators may take include using hand signals, flashing lights, or other audible signals to indicate the presence of the train.
In the event of a train whistle or horn failure, train operators must prioritize the safety of everyone involved and take necessary measures to ensure that other vehicles or pedestrians are aware of the train's presence.