Kavach
India's Indigenous Automatic Train Protection System
Kavach is India's indigenously developed Automatic Train Protection (ATP) system, designed to prevent train collisions by automatically controlling speed and applying brakes when human response is insufficient. Development began in 2011 as an open-architecture system, with field trials commencing in 2014 and the first passenger-train trials in 2016.
The Ministry of Railways formally adopted Kavach as the National ATP System in July 2020. It received Safety Integrity Level 4 (SIL-4) certification in 2019, the highest possible safety integrity level — meaning the probability of a dangerous failure is less than 1 in 100 million hours of operation.
Kavach is broadly equivalent to Level 2 of the European Train Control System (ETCS), the international benchmark for train protection, though it is not a direct replacement for lineside signals.
- Core functions: Prevents Signal Passed at Danger (SPAD), enforces speed limits, applies automatic brakes if the driver is incapacitated, and enables trains to operate safely in zero-visibility (fog) conditions.
- Communication: Uses radio frequency (RF) communication between loco-pilot cab, track-side equipment, and station master systems.
- Kavach 4.0 improvements (RDSO approval: July 2024): Improved location accuracy, enhanced signal information in complex railway yards, station-to-station communication via optical fibre, and direct integration with electronic interlocking systems.
- Kavach 5.0 is in development with further enhancements planned.
- Developed by: Medha Servo Drives, HBL Power Systems, and Kernex Microsystems (Indian vendors).
● Tracked since March 12, 2026 · last seen July 27, 2026 · updates as the daily brief publishes