Track warrants are systematized permissions used on some rail lines instead of signals. As an example, the Burlington Northern Santa Fe Railway (BNSF) uses track warrants on the "El Paso Sub" line which runs from Belen, New Mexico to El Paso, Texas. There are no electrical signals on this route.
Train drivers communicate by radio with the dispatcher (in this example located in Fort Worth, Texas) and receive their warrants for sections of track, with speed limits and beginning and ending mileposts delineated. Maintenance crews also get track warrants so they can have the section of track to themselves as needed.
The TrackWarrant thus enables trains to leave the Station, whether it is in the Main Track or in the Siding.
Unless boxes 1, 5, 6 or 7 indicates differently, TrackWarrant is in effect as soon as the dispatcher has checked its correct reception by the train, and remains in effect until the train has reported the Limits clear.
However, the TrackWarrant remains in effect until the Limits are reported clear by the train.
Trackwarrants restricting the authority or movement of a train must not be sent in this manner unless it is known that the train being restricted will not leave the point without receiving the trackwarrant.
When a trackwarrant is in effect and the limits or instructions are changed, a new trackwarrant is issued with the instructions and will include the words "TrackWarrant No______ is void." When a trackwarrant of a previous date is voided, the date must be included.
A trackwarrant is in effect until a crew member reports the train clear of the limits, the warrant becomes void, or the time limit expires.
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