The leading end of the movement must not exceed __________ over the crossing?

• A. 15 mph
• B. 10 mph
• C. 25 mph
• D. 20 mph

Answer: (A)

The front end of a movement is limited to a maximum speed of 15 mph as it crosses a railroad crossing. This limit is chosen to give enough time to observe the crossing, respond to any hazards, and ensure the leading end clears the crossing safely before the rest of the train follows. Exceeding 15 mph would reduce reaction time and raise the risk to vehicles, pedestrians, and the train itself. Slower speeds are permissible, but the rule specifies 15 mph as the upper limit, which is why this option is the correct one. Speeds like 20 mph or 25 mph would violate the limit, while 10 mph is simply slower than the maximum.