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Train Collision Prevention


The Intellectual property rights of RAKSHA KAVACH™ are held by Konkan Railway Corporation Limited (KRCL).

This equipment is manufactured by Kernex Microsystems (India) Limited (KMIL) under exclusive license from KRCL and the same is installed, commissioned and maintained by KMIL

One of the most widely used and comfortable modes of transportation system is the train, but occasionally, accidents occur due to collisions as well as other reasons. It is very difficult to stop such collisions because of speed of moving trains, which need a lead distance to stop. Collisions happen due to human errors and/or faulty equipment. We jointly with KRCL took up an Intensive analysis of major accidents that have occurred in India. The functional requirements of the clients and operational safety procedures have been fully considered for designing the logics.

Based on the concept and domain knowledge provided by Konkan Railway Corporation Ltd, we developed the networked Anti-Collision system which is a customized version of RAKSHA KAVACH product, using Global Positioning System, Radio Communication, and Application Logics and inter-facing these with an auto breaking system in the train, conforming to the functional requirement specifications laid down by Konkan Railway Corporation Ltd.

The product has been successfully developed for deployment after initial and extended field trials on the Amritsar-Jalandhar Section of Northern Railway using 125 ACDs of different types.

On 20th January'2004, the then Honorable Railway Minister launched the project at Kishangunj, Bihar on a 1730Kms rail route on the Northeast Frontier Railway route.

We have successfully completed ACD deployment over 736Kms on the Konkan route and another 1730Kms on the Northeast Frontier Railway routes is nearing completion. The above routes consist of some of the most inhospitable rail sections of the country. The work involved surveys of the tracks, erection of towers, manufacturing and supply and commissioning of networked ACD system and customizing the same.

The system consists of Loco ACD with a console (message display) for the driver (in each Loco Engine), Guard ACD with remote (fitted in Guard Van), Station ACD with console (fitted in Station Masters' Cabin), Manned and Unmanned Gates ACD with hooters and flashers (in each location) and Repeater ACDs (fitted at locations having obstructions in radio communication such as hilly areas) which work in concert to prevent the following kinds of collisions and accidents.

  • Head on collisions
  • Rear end collisions
  • Collisions due to derailment
  • Collisions at the level crossing gates
  • Collisions due to inactive crew
  • Collisions due to train parting
  • Collisions in non–Interlocked Stations
  • Accident due to Landslides and Falling Boulders

We plan to add the following additional features for ACDs by integrating with special sensors:

  • Detecting Overflowing rivers and bridges
  • Detecting Displaced tracks
  • Detecting Accidents in Tunnels

Since, Anti Collision System are cost effective solutions to prevent train collisions, and is not dependant on the existing infrastructure, It can be easily modified to work with suitable modifications on any railway network in the world.

Advantages of Networked ACD System

Auto Acting Devices

The Networked Anti-collision system consists of a Network of Auto Acting Micro processor based communication devices that will trigger off automatic brakes of trains whenever a collision like situation would arise.

Designed for preventing collisions

The system is specially designed to prevent collisions at the stations, mid sections, level crossings, and parallel sections.

Provide distance scan

The system provides a distance scan over a range of nearly 3 KMs, thereby detecting collision like situations, if any, take appropriate action to prevent collision, by constant data communication- interchange in the area.

Communication based Control System

Through data communication, Loco ACD in the Locomotive, Station ACD in the station, Level crossing Gate ACDs (manned as well as unmanned level crossings), are networked and are constantly in communication with each other within a range of 3 KMs. If the communication range is reduced due to obstructions, it is extended by providing Repeaters along the track.

Does not interfere with Normal Traffic

Here in all cases, even though movement of train is controlled through data communications, where in standard rules are implemented to avoid collision on railroads, the ACDs do not interfere with normal operational procedures and traffic. In normal conditions, the driver is still solely responsible for the safety and control of the train, along with the guard.

Train collision