If a track restriction is transmitted, what two elements must accompany it to ensure linkage to the correct train?

• A. Train ID and speed
• B. Train ID and location
• C. Speed and location
• D. Authority number and location

Answer: (A)

In track warrant control, a track restriction must be tied to a specific movement so it’s clear which train the instruction applies to. The two elements that accomplish this are the train identification and the speed for that restriction. The train ID identifies which train is authorized to use the restriction, linking the instruction to the correct train, while the speed provides the required motion limit within that restriction so the engineer knows how fast the train may proceed. Without the train ID, the restriction could apply to any train in the area; without the speed, there’s no enforceable limit for that movement. Location alone identifies where the restriction is, but not which train or what speed is allowed.