Indian Railways has commissioned Kavach Version 4.0 for the first time on South Central Railway (SCR), upgrading the indigenous Automatic Train Protection (ATP) system from Version 3.2 to Version 4.0 over 108 route kilometres on the Malkajgiri-Kamareddi section of the Hyderabad Division.
The upgraded system brings enhanced safety features, improved reliability and technological improvements aimed at supporting safer train operations. The latest version has been developed based on operational experience gained from the deployment of Kavach Version 3.2 across 1,465 route kilometres on South Central Railway.
Kavach is an indigenously developed Automatic Train Protection system designed to assist loco pilots in maintaining trains within prescribed speed limits. If the loco pilot fails to respond when required, the system can automatically apply brakes to help control the train and avoid unsafe situations.
The system is designed to prevent Signal Passing at Danger (SPAD), regulate train speed during critical situations and reduce the risk of collisions. It also supports safer train movement during adverse weather and low-visibility conditions.
Kavach Version 4.0 introduces several technological improvements over the earlier version. These include greater location accuracy for more precise train positioning, improved information on signal aspects in larger yards, station-to-station Kavach communication through Optical Fibre Cable (OFC), and direct interfacing with existing Electronic Interlocking Systems.
The system carries the highest safety certification, Safety Integrity Level-4 (SIL-4), required for safety-critical railway applications. Its deployment involves equipment at stations and block sections, RFID tags along the track, telecommunication towers, optical fibre connectivity and Loco Kavach equipment on locomotives.
The commissioning on the Malkajgiri-Kamareddi section follows extensive trials and development work undertaken after the deployment of Version 3.2 on South Central Railway. Kavach Version 4.0 was approved by the Research Designs & Standards Organisation (RDSO) in July 2024.
Indian Railways has planned large-scale deployment of the upgraded version across its network. The expansion is aimed at strengthening Automatic Train Protection coverage while integrating the system with existing signalling and railway infrastructure.
The commissioning of Version 4.0 on South Central Railway adds another section to the growing deployment of Kavach and represents the next stage in the development and rollout of India’s indigenous train protection technology.
