Dunris This technology, operating in the 30—60 kHz frequency range to communicate trains and wayside equipment, was widely adopted by the metro operators in spite of some electromagnetic compatibility EMC issues, as well as other installation and maintenance concerns. Mixed mode operation for Kuala Lumpur. Since every block is a fixed section of track, these systems are referred to as fixed block systems. Tokyo Metro Hibiya Line.

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System Hardware 1. SMC remote terminals at other locations on the wayside 5. Snoopers 7. The communication between different subsystems can be through wired media copper or fibre optics e. It maintains the moving block separation of trains, ensures the required routes are followed, oversees the train operation and provides all necessary functions to support automatic operation of trains.

The VCC is a vital subsystem fully qualified to ensure safety of operation and able to handle failures and emergencies as they arise. Since the VCC subsystem has vital control requirements, check-redundant processor units are used. Availability is achieved through the use of redundant units.

The VCC is capable of operating trains automatically, with limited human intervention. From the tracked train position, the VCC transmits the limit of movement authority to the Controlled Train. Automatic train operation is completed by the Vehicle On-Board Controller VOBC which translates the limit of movement authority and commands the application of propulsion and braking.

In addition, the VCC can command speed limits, braking rates and station stops. The VCC enforces a minimum safe separation between trains based on the safe braking distance from the last verified location of the rear of a preceding train or any other obstruction such as points or closed tracks. The VCC monitors the status of all points by cyclically polling the station controllers for status.

Points in the vicinity of the train are reserved and positioned before the train is allowed to operate across them. Point reservations prevent conflicts with other trains and with Operator initiated reservation or point movement requests. The Snooper reads control signals and telegram data and formats a frame information packet for data recording and display. Snooper software is used to view and analyse the telegram data locally. As well, a communication link will be provided to each Snooper to allow remote access to logged data.

The SCS provides the following control and monitoring functions: vital point control and supervision reporting of axle counts vital control and monitoring of trainstops and signals; vital Monitoring and reporting ESDs and other vital Wayside devices non-vital control and monitoring of Current On Line relays, SER power alarms, SER domestic services alarms, point heaters, etc.

The Detection Points are attached to the rails at each end of a track section and generate an electric field to detect the passage of individual steel train wheels axles.

The Detection Points maintain a count of axles passing by their location and are also able to determine the direction of travel. This information is periodically passed to the ACE which evaluates the axle counts and direction from all the Detection Points associated with a particular section to vitally determine the current track occupancy status.

VOBC Electronics.


CBTC Overview Wayside Equipment

The system can handle a mixture of on-street and segregated driving. Train detection is fundamentally performed by loops with optional track circuits where needed or possible. Point machines can be either street type or railway type. This is a modern computer-based control and supervision system allowing the operator to give commands through a mouse or keyboard with the facility to have the position of the vehicles and optional wayside objects shown on both, normal display screens and large rear projection screens.



Since every block is a fixed section of track, these systems are referred to as fixed block systems. A few months later, in June , Alstom introduced the railway application of its radio technology on the Singapore North East Line. These systems, which were also referred to as transmission-based train control TBTC , made use of inductive loop transmission techniques for track to train communication, introducing an alternative to track circuit based communication. This technology, operating in the 30—60 kHz frequency range to communicate trains and wayside equipment, was widely adopted by the metro operators in spite of some electromagnetic compatibility EMC issues, as well as other installation and maintenance concerns see SelTrac for further information regarding Transmission-Based-Train-Control. As with new application of any technology, some problems arose at the beginning mainly due to compatibility and interoperability aspects.


Bombardier CBTC to ease congestion in Melbourne

To achieve this, the Metro Tunnel project will create a new end-to-end rail line from Sunbury in the west to Cranbourne and Pakenham in the south-east. The project scope includes twin nine-kilometre rail tunnels, five new underground stations and high capacity signalling. To maximise the efficiencies of this new route, an advanced communications-based train control CBTC system will be installed on the line and in the new tunnel. CBTC is a method of signalling where the position of a train is established by direct communication between the train and track. Traditionally, as a train passes signals on a network, that train is considered to be occupying a fixed stretch of railway at a time, and no other train is allowed to enter that block. This facilitates a shorter headway — the minimum allowable, safe distance between two trains moving in the same direction along a railway — and thus allows for increased capacity.


CITYFLO – safe and efficient urban solutions

Bombardier will deliver the signalling and rail control solution and systems integration. The system will be ready for operation in Bombardier has been active in Australia for more than 60 years, delivering its extensive portfolio of winning mobility solutions from train and tram fleets to signalling, propulsion and control technology, mining solutions, asset management and through-life support on rail projects across the country. About Bombardier Transportation Bombardier Transportation is a global leader in rail technology and offers the broadest portfolio in the industry. It covers the full spectrum of rail solutions, ranging from trains to sub-systems and signalling. The company also provides complete transport systems, e-mobility technology and maintenance services. As an innovation driver, Bombardier Transportation continuously breaks new ground in sustainable mobility.

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