The Ministry of Railways has commissioned KAVACH Version 4.0, an upgraded automatic train protection system, on the South Central Railway for the first time. The system is now operational on a 108-kilometre stretch between Malkajgiri and Kamareddi in the Hyderabad Division of Telangana. This represents a significant advancement in India’s indigenous railway safety technology.
KAVACH is an indigenously developed system designed to prevent accidents by automatically controlling train speed and applying brakes when needed. The new version includes several technological improvements that make it more reliable and easier to integrate with existing railway infrastructure across India’s diverse rail network.
Key facts
- KAVACH 4.0 commissioned on Malkajgiri-Kamareddi section covering 108 route kilometres
- Upgraded from KAVACH Version 3.2 to Version 4.0
- Located in Hyderabad Division of South Central Railway
- KAVACH 3.2 already deployed over 1,465 route kilometres on South Central Railway
- System requires Safety Integrity Level-4 (SIL-4) certification, the highest safety standard
- Commissioned on 23 September 2026
What KAVACH does
KAVACH is an Automatic Train Protection system that assists locomotive drivers in maintaining prescribed speed limits. If a driver fails to reduce speed when required, the system automatically applies brakes to prevent accidents. It is specifically designed to prevent Signal Passing at Danger (SPAD), a critical safety hazard where trains cross red signals. The system also helps control train speed in dangerous situations and reduces collision risks, while improving operations during bad weather.
Improvements in KAVACH 4.0
The upgraded version incorporates four major enhancements based on experience from deploying earlier versions. First, it offers increased location accuracy, allowing more precise positioning of trains on the track. Second, it provides improved information about signal aspects in larger rail yards, helping drivers understand track conditions better. Third, it introduces station-to-station communication through Optical Fibre Cable, strengthening the connection between different sections of the rail network. Fourth, it can directly connect with existing Electronic Interlocking Systems, making it compatible with signalling infrastructure already installed on Indian Railways.
Infrastructure required for KAVACH
Deploying KAVACH involves installing multiple technological components along railway sections. These include KAVACH equipment at stations and block sections, RFID tags throughout the track, telecommunication towers for wireless communication, Optical Fibre Cable laid along the track, and KAVACH units installed on locomotives. This comprehensive infrastructure ensures the system can communicate with trains and control their movement effectively.
Scaling up across Indian Railways
Indian Railways plans to deploy KAVACH 4.0 across the entire network in the coming years. The successful commissioning on South Central Railway provides a template for large-scale implementation. The system has been tested extensively and certified at Safety Integrity Level-4, the highest international standard for railway safety systems. This makes it suitable for deployment on India’s diverse rail network, which operates trains at different speeds and on various types of tracks.
What this means for you
Passengers travelling on sections equipped with KAVACH 4.0 will benefit from enhanced safety measures that reduce the risk of accidents caused by driver error or signal violations. The system operates automatically, meaning increased safety without requiring changes to how trains are operated. Railway staff and locomotive drivers will have access to more precise information about train positioning and track conditions. Over time, as KAVACH 4.0 is deployed across more sections, railway travel across India will become safer and more reliable.