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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.
Fixed mechanical signals began to replace hand signals from the 1830s. These were originally worked locally, but it later became normal practice to operate all the signals on a particular block with levers grouped together in a signal box. When a train passed into a block, a signalman would protect that block by setting its signal to 'danger ...
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". Only one train may occupy a block at a time, [citation needed] and the blocks are sized to allow a train to stop within them. [1]
Direct traffic control (DTC) is a system for authorizing track occupancy used on some railroads instead of or in addition to signals.It is known as "direct" traffic control because the train dispatcher gives track authority directly to the train crew via radio, as opposed to through wayside personnel via telephone or telegraph, as in train orders.
Direct Traffic Control, or DTC, is similar to TWC, except that the rail line is divided up into predefined blocks—somewhat similar to ABS blocks without the signals—and dispatchers authorize trains to proceed in a specified number of blocks. Only one train may occupy a stretch of authority (which may consist of a single block or a stretch ...
30 single cars (no lavatory) 1977 Self-propelled cars. Single Arrow III MU's are GE Model MA-1J, married pairs are GE Model MA-1H. 160 cars are in revenue service. Rebuilt 1992–1995 by ABB; 1319 features heritage Lackawanna Railroad decals. 1334–1533 200 paired cars (lavatory in odd cars) Bombardier Comet II: 5300–5460 161 trailers (no ...
A train of Arrow III cars at South Orange in 1986 A train of Arrow III cars headed east through Rahway. The Arrow IIIs were built in 1977 and 1978 by General Electric [7] in the same fashion as the Arrow IIs. They consist of 200 cars built as married pairs (1334–1533) and 30 single cars (1304–1333). [2]
There are two main types of signaling aspect systems found in North America, speed signaling and weak route signaling. [citation needed] Speed signaling transmits information regarding how fast the train is permitted to be going in the upcoming segment of track; weak route signaling transmits information related to the route a train will be taking through a junction, and it is incumbent upon ...