If the train whistle becomes inoperative, what is the first action the train operator must take?

When a train whistle becomes inoperative, the first action the train operator must take is to call the control center. This step is crucial because the control center needs to be informed of the situation immediately to assess the risk and coordinate a response to ensure the safety of the train, passengers, and other rail users. Communicating with the control center allows for the possibility of rerouting or providing additional instructions to the operator, which could be critical in preventing accidents.

Prompt communication also ensures that necessary safety protocols are put into place without delay. The control center can guide the operator on the next steps, which might involve slowing the train down, stopping at the next designated location, or taking other precautionary measures.

The other options, while they might seem like reasonable responses to the loss of the whistle, do not address the immediate need to report the malfunction and allow for coordinated action with the overseeing railway operations.