Which speed category applies when a movement must be able to stop within half the range of vision?

Which speed category applies when a movement must be able to stop within half the range of vision?

• A. Not exceeding 15 MPH.
• B. For passenger trains, not exceeding 45 MPH; for freight not exceeding 40 MPH.
• C. Restricted Speed
• D. A speed not exceeding 30 MPH.

Answer: (C)

Restricted speed is the speed at which a movement must be able to stop within half the range of vision. This rule is used when you cannot see far enough ahead to stop safely at normal operating speed, so you must slow down enough that if a signal, obstacle, or unexpected condition appears within the distance you can clearly see, you can bring the train to a stop in time. The concept centers on ensuring you have sufficient stopping distance given what you can observe ahead, accounting for reaction time and braking. The other fixed mph options describe specific numerical limits used in particular situations, but they don’t capture the stopping-distance requirement that defines restricted speed.

Restricted speed is the speed at which a movement must be able to stop within half the range of vision. This rule is used when you cannot see far enough ahead to stop safely at normal operating speed, so you must slow down enough that if a signal, obstacle, or unexpected condition appears within the distance you can clearly see, you can bring the train to a stop in time. The concept centers on ensuring you have sufficient stopping distance given what you can observe ahead, accounting for reaction time and braking. The other fixed mph options describe specific numerical limits used in particular situations, but they don’t capture the stopping-distance requirement that defines restricted speed.