Use of Track Warrants On Specific Railroads
The BNSF Railway uses track warrants on its El Paso Subdivision which runs from Belen, New Mexico to El Paso, Texas, with the dispatcher in Fort Worth, Texas. There are no electrical signals on the route. BNSF also uses TWC (Track Warrant Control) on its Forsyth Subdivision between Jones Jct. (a suburb of Billings, Montana) and Hysham, Montana. Unlike the El Paso Subdivision, ABS is used. Some smaller Class II railroads, such as the Iowa Interstate Railroad, and many Class III railroads are dispatched completely by track warrant.
Canadian railways use a similar system called Occupancy Control System (OCS), in which movements are controlled via clearances issued over the radio from the Rail Traffic Controller to the train. The system is in wide use on lines that aren't installed with centralized traffic control (CTC).
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