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A block instrument on the Midland Railway. Signalling block systems enable the safe and efficient operation of railways by preventing collisions between trains. The basic principle is that a track is broken up into a series of sections or "blocks".
Automatic block signaling (ABS), spelled automatic block signalling or called track circuit block (TCB [1]) in the UK, is a railroad communications system that consists of a series of signals that divide a railway line into a series of sections, called blocks. The system controls the movement of trains between the blocks using automatic signals.
2: 3-1 Ordinary passenger train; breakdown train not going to clear the line; officers' special train 3: 1-3-1 Freight train capable of running at more than 75 mph; parcels train; nominated (priority) empty passenger trains; autumn railhead treatment train 4: 3-1-1 Freight train that can run at up to 75 mph 5: 2-2-1 Empty coaching stock 6: 5
A rail break between the insulated rail joint and the track circuit feed wiring would not be detected. Failure modes that result in an incorrect "track clear" signal (known usually in North America as a "false clear") may allow a train to enter an occupied block, creating the risk of a collision.
The new rails usually need to be prepared prior to the arrival of track renewal train. Rails are delivered to the center of the track. Those rail pieces are welded by track workers to form continuous welded rail (CWR) and left at the center of the track at the exact position required by the track renewal train to pick up at its arrival. [2]
The rails, which can be either traditional Vignole Rails with a head, web and foot, or block rails with no web, are either cast into the slots by an elastic compound or surrounded by a close-fitting boot before being fixed in place with grout. Both the surface mounted rail and the embedded block rail can be simply removed and replaced.
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