Final answer:
If the train whistle becomes inoperative en route, the operator should continue the journey without the whistle. Informing passengers about the situation is important, but fixing the whistle or blowing the horn manually may not be necessary or practical.
Step-by-step explanation:
If the train whistle becomes inoperative enroute, the operator should continue the journey without the whistle. The train whistle is an important safety device used to alert pedestrians and other vehicles of the train's presence. However, if the whistle is not functioning, it is still possible to proceed with the journey by using other communication methods such as hand signals or radio communications to maintain safety.
Stopping the train and fixing the whistle may cause unnecessary delays and disrupt the train schedule. Therefore, it is not the ideal solution unless there is an imminent danger that requires immediate attention.
Informing the passengers about the situation is important to ensure transparency and provide reassurance. However, this alone does not address the issue of the inoperative whistle. Blowing the horn manually is an option if there is a secondary manual horn available. However, this may not be feasible in all cases.