Track Warrant Control (TWC)
A method of traffic control wherein trains are authorized for movement only between specified locations. The form giving a train crew the authority to operate between two locations is called a track warrant.
Track Warrant Control
(TWC) A method of authorizing the movements of trains or engines or protecting men or machines on a main track within specified limits in territory designated by special instructions or general order.
Track Web ...
Track warrant control is the baby in methods of train dispatching. My first exposure to it was in 1985 with the issuance of the General Code of Operating Rules (GCOR).
Track Warrant Control (TWC)
A method to authorize train movements or protect men or machines on a main track within a specified limits on a territory designated by the timetable.
Track Wrench ...
Under track warrant control, the dispatcher gives a section of track to the train and he can then establish meets at the interlockings. If ABS is still available, it will continue to serve the same function as noted above.
Today the Train Order System is obsolete and has been succeeded by systems permitting train movements by radio. At least 3 such systems are in operation in North America, namely Track Warrant Control (TWC), ...
 See also: Track, Crew, Train, Point, Timetable
  
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