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The "superior" train has Right-of-Track over the "inferior" trains. To move the "inferior" train against a "superior" train, Train Orders are used to govern the movement. On this railroad, a compilation of Train Rules such as superiority, and Block Rules such as a "Clear-Block" is used to proceed on the main track. Centralized Traffic Control (CTC)
These moving block systems have become popular since the required technology first started appearing in the 1970s. In such systems, any train on the route can listen for signals from all the other trains, and then move in a way to ensure they have enough distance to stop. Early moving block systems used a cable strung along the rail line.
Automatic Block - Block aspects convey basic track occupancy information and advise the engineer (operator) which of the basic signal rules (common to all railroads) he/she is to follow in the operation of his/her train at any point on the railway line. These include Clear (ARA Rule 281, see Figure), Advance Approach and Approach (Rule 285 ...
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.
The safety distance (safe-braking distance) between trains in fixed block and moving block signalling systems. In railway signalling, a moving block is a signalling block system where the blocks are defined in real time by computers as safe zones around each train. This requires both knowledge of the exact location and speed of all trains at ...
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.
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