In case of hazardous situations, train control systems prevent train collisions by notifying dispatchers and train drivers, for example, when the distance between trains is critical. To achieve this, the supervisory subsystem retrieves data from the relay and electrical interlocking devices to process and visualise it on the central dispatch panel.
WSP has integrated different systems in order to ensure maximum safety. For the Delhi Metro, we were responsible for the design, specifications, tendering and construction phase support services of many rail system elements, including the automatic train control system.
Communications Based Train Control (CBTC) Systems
Necessary characteristics of CBTC systems include:
- High resolution train location determination, independent of track circuits
- Continuous, high capacity, bi-directional train to wayside data communications
- Train-borne and wayside processors performing vital functions
Positive Train Control (PTC) Systems
PTC systems help in preventing accidents caused by train operators or dispatcher errors and characteristics include:
- Train separation or collision avoidance
- Line speed enforcement
- Temporary speed restrictions
- Rail worker wayside safety