Question

The operator of the an express train notices that the operator's indication light is out when the train is in motion about midway between subway express stations. According to the most recent regulation, his first action must be to ________.

Answer 1

Since the exact regulation is not provided in the question, it is impossible to state definitively what the first action of the train operator should be when the indication light is out. Safety protocols generally require prioritizing the safety of passengers and equipment.

Step-by-step explanation:

The question pertains to an operator of an express train noticing that the operator's indication light is out while the train is in motion. Considering the relevant information provided, while there is no specific regulation stated, in most safety protocols related to transportation, an operator's first action should be to ensure the safety of the passengers and the train. If the indicator light is essential for safe operation, the operator would need to follow protocol which could involve stopping the train or contacting a control center.

However, since the question lacks context and specific regulations, it is not possible to provide an exact action that the operator must take.