What is the difference between track authorities and route clearances?

• A. Track authorities authorize movement on a certain track; route clearances authorize movement on a specific route through signals/interlockings.
• B. Route clearances authorize movement on a track; track authorities authorize movement on a route.
• C. Track authorities oversee passenger conduct; route clearances authorize speed.
• D. Route clearances set train schedules; track authorities control signaling.

Answer: (B)

Movement authority in a railroad system comes in two parts: track authority and route clearance. A track authority is the permission to occupy and move on a specific track or track segment. It controls where you are on the rails. A route clearance is the permission to proceed along a defined path from a start signal through the signals and interlockings to a designated destination. It dictates the exact route you will follow, including which switches or turnouts are used, so the signaling system can be set for that path and prevent conflicts with other trains.

For example, you might have a track authority to occupy a mainline segment, and a separate route clearance that specifies the path through a junction into a yard. The route clearance ensures the route through the interlockings is reserved for your movement, while the track authority ensures you actually have the right track segment to use.

Why the other ideas don’t fit: route clearances aren’t simply about moving on a single track; they define the entire path through signals and interlockings. Track authorities aren’t about passenger conduct or speed control by themselves, and they aren’t about setting schedules—their roles are occupancy of track and the defined routing through signaling.