Final answer:
If there is a loss of power, the train operator does not need to evacuate the passengers, but should notify the control center and call for maintenance assistance.
Step-by-step explanation:
If there is a loss of third rail power and the train operator has permitted the train to coast to a stop between stations, he need not necessarily evacuate the passengers. In this situation, the train can safely come to a stop without the need for passengers to be evacuated. However, it is important for the train operator to notify the control center and call for maintenance assistance.