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CBTC is a signalling standard defined by the IEEE 1474 standard. [1] The original version was introduced in 1999 and updated in 2004. [1] The aim was to create consistency and standardisation between digital railway signalling systems that allow for an increase in train capacity through what the standard defines as high-resolution train location determination. [1]
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 any given time, and continual communication between the central signalling system and the train's cab signalling ...
An example of headway on a railway system with multiple block section. Train B can only enter a section with a green or yellow "aspect" (light), and must reduce speed when passing a yellow signal to the point where they can stop within the sighting distance. Train movements in most rail systems are tightly controlled by railway signalling ...
CITYFLO 650 CBTC system CITYFLO 650 signalling is a CBTC system designed by Bombardier Transportation and later Alstom . It makes use of bi-directional radio communication between trains and wayside equipment, as well as true moving block technology, to control train operation.
Trainguard MT is a communication-based train control (CBTC) developed by Siemens Transportation Systems (ex Matra Transport international, and now integrated into Siemens Mobility) which allows fully automated circulation of rapid transit trains, and thanks to moving block system, less time between trains.
Trains, with CBTC, can then operate closer together, although as before, platform dwell times and train performance are the true limiting factors in terms of headway performance. With the new system, signals and interlockings are still required, their job being done better by relay interlockings or Solid State Interlocking controllers. [ 6 ]
"CBTC systems allow optimal use of the railway infrastructure as well as achieving maximum capacity and minimum headway between operating trains, while maintaining the safety requirements. These systems are suitable for the new highly demanding urban lines, But also for resignaling for existing lines in order to improve their performance
For Alstom, it uses the URBALIS 300 moving-block communications-based (CBTC) Automatic Train Control (ATC) system, which optimizes headway and enables extra trains to be injected automatically into the system at rush hour to increase passenger capacity and reduce congestion. [6] In the depot, trains are also operated in fully automatic mode.