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Track warrants are issued granting main track use between two named points (i.e. milepost sign, station, or any fixed physical point, such as a switch).The dispatcher may also issue time constraints (known as "Box 6" on a standard form), although the track warrants remain in effect until cleared by a member of the receiving crew.
Form D Control System, or DCS, is a system similar to Track Warrant Control that is used by railroads subscribing to NORAC (Track Warrant Control is a GCOR term). The name comes from the form that train crews copy the authority onto. A sample Form D is available here; line two is used to grant authority for occupying the track.
Authority to occupy a track is received directly from the dispatcher, with the train crew filling out the details on a form, similarly to as in Track Warrant Control. At the end of their authority, the crew "fulfills" the order, after which another order may be issued for another train to occupy that track.
These take the form of routing decisions at controlled points that authorize a train to proceed or stop. Local signaling logic will ultimately determine the exact signal to display based on track occupancy status ahead and the exact route the train needs to take, so the only input required from the CTC system amounts to the go, no-go instruction.
The General Code of Operating Rules (GCOR) is a set of operating rules for railroads in the United States.The GCOR is used by Class I railroads west of Chicago, most of the Class II railroads, and many Short-line railroads.
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CHICAGO (CBS) — Targeted immigration enforcement operations by multiple agencies were launched in Chicago Sunday, with top Trump administration officials in the city to oversee the operation.
A method to dynamically inform the speed control unit of changing track or signal conditions. [28] Optionally, three additional components may exist: An on-board navigation system and track profile database to enforce fixed speed limits; A bi-directional data link to inform signaling equipment of the train's presence