What do the start and end mileposts define in a track warrant?

• A. The points at which the crew must check fuel.
• B. The dispatcher's schedule.
• C. The points on the track that define the authority limits.
• D. The crew's rest breaks.

Answer: (C)

In track warrant control, the start and end mileposts define the segment of track the crew is authorized to occupy. Mileposts are fixed markers along the railroad, and the authority granted by the warrant runs from the start milepost to the end milepost. While within those bounds, the train must follow the warrants’ instructions, including any speed or movement restrictions. Once you reach the end milepost, the warrant’s authority ends unless you receive a new warrant or clearance to continue. The other options don’t fit because fueling checks, schedules, or rest breaks are not determined by these mileage markers.