Final answer:
The correct procedure for a train motorman to resume journey after stopping is not provided in the options, but typically involves safety checks and ensuring the track and signals are clear.
Step-by-step explanation:
When a train with flat cars has stopped and the motorman wishes to proceed again, the correct procedure is not specified in the provided options. However, common sense and standard operating procedures dictate that a motorman should carefully check the train's surroundings, ensure that the track is clear, and that all signals and signs permit proceeding. Once safety checks have been completed and it is safe to do so, the train can resume its journey.
When a train with flat cars has stopped and the motorman wishes to proceed again, he must check if the path is clear and then accelerate the train. It is important for the motorman to ensure that there are no obstacles or other trains in the way before proceeding. Once the path is clear, the motorman can gradually increase the speed of the train to resume its journey.