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CBTC Control System with Wireless Communication

Hitachi has developed Communication-Based Train Control (CBTC) Systems as the next generation of signaling technology that is increasingly being adopted in subways and other new modes of transportation. These systems integrate equipment installed on the trains with land-based equipment, using wireless communications to collect position information from trains and send back control signals. This significantly reduces the amount of wayside equipment and facilitates benefits such as high traffic densities and the adoption of single-driver or unmanned trains.
Another advantage of the system is its use of the general-purpose 2.4 GHz band, which makes it suitable for many different countries and regions. The system has also been made robust enough to prevent interference from other wireless users and allow its use in mission-critical situations. For example, Hitachi's CBTC system was selected for the Chongqing Monorail Line 3 in China, which commenced operation in September 2011 (operating on 17km of the total 55.6km line), and further installations are planned. Hitachi draws on this experience to accelerate its global business activities in the railway systems sector.
Finally, CBTC enables the operator to efficiently control the train's acceleration and deceleration to maximize energy efficiency.

Train Control Architecture of CBTC

  • Intermittent train control based on "distance-to-go"
  • Effective use of cab signalling and moving block
  • Reduced headway (enhanced capacity, lower environmental impact, less disruption and quicker recovery, etc.)
  • Lower life-cycle costs through reduction of trackside equipment

Train Control Architecture of CBTC