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Indian Railways approved Kavach Version 4.0 on the remaining sections covering 712 route kilometres (Rkm) of Moradabad Division, Northern Railway, at a cost of Rs 170 crore.
An 11 km bypass line between the Adra end and Joychandipahar on South Eastern Railway was sanctioned at Rs 272 crore; it is part of the Energy, Mineral and Cement Corridor and is expected to carry an additional 8.88 MTPA of traffic.
Electronic Interlocking was approved at 21 stations of Samastipur Division, East Central Railway, at Rs 233 crore, replacing the existing Panel Interlocking and enabling Kavach.
The Bhavnagar Para yard remodelling in Gujarat was sanctioned at about Rs 125 crore to decongest Bhavnagar Terminus, taking the four same-day sanctions to roughly Rs 800 crore.
Kavach is India's own Automatic Train Protection system, originally developed under the name Train Collision Avoidance System (TCAS). It was developed by the Research Designs and Standards Organisation (RDSO) together with three Indian firms - Medha Servo Drives, HBL Power Systems and Kernex Microsystems. Field trials of the first version were held in 2015-16, the specification was formalised in 2017, SIL-4 safety certification was obtained in 2019 and Kavach was adopted as the national ATP system of Indian Railways in 2020. It works through two-way radio communication between trackside towers at stations and equipment on the locomotive, with RFID tags laid along the track and at stations telling the loco equipment exactly where the train is. If the loco pilot passes a signal at danger, over-speeds or fails to brake, Kavach applies the brakes itself. Version 4.0, approved by RDSO on 16 July 2024, adds better location accuracy, better signal-aspect information in large yards, a station-to-station Kavach interface over optical fibre cable and a direct interface to existing Electronic Interlocking - which is why the Samastipur EI sanction is described as supporting Kavach.
Simple Analogy: Think of it as cruise control with a conscience: the driver still drives, but the system continuously knows the speed limit and the signal ahead, and takes the brake pedal away from the driver the moment the train is about to break a rule.
| Aspect | Panel Interlocking (PI) | Electronic Interlocking (EI) |
|---|---|---|
| Core technology | Relay-based electrical circuitry | Computer/software-based interlocking with almost no relays |
| Operation | Individual switches and push buttons on a panel in the Station Master's room, with the yard layout drawn on the panel | Route setting through software on a computer-based console |
| Fault diagnosis | Slower - requires physical tracing of relay circuits and wiring | Faster - software diagnostics identify the fault |
| Yard layout change | Needs rewiring of the relay circuits | Mostly a software and output-configuration update |
| Kavach readiness | Not designed for a direct Kavach interface | Kavach 4.0 provides a direct interface to existing Electronic Interlocking |
Sole R&D wing of the Ministry of Railways; designer of Kavach and issuer of its specifications; technical adviser and consultant to the Railway Board; the first institution declared a Standard Developing Organisation (SDO) under the Bureau of Indian Standards' 'One Nation One Standard' mission. Formed in 1957 by merging the Central Standards Office with the Railway Testing and Research Centre (set up 1952).
Set up in 2006 under the Ministry of Railways to build and operate India's dedicated freight corridors. The Eastern DFC runs Ludhiana to Sonnagar (1,337 km) and the Western DFC runs Dadri to JNPT (1,506 km) - together about 2,843 km. Freight-capacity works such as the Adra bypass sit in the same policy space of shifting bulk cargo off mixed-traffic lines.
Maharatna, Schedule 'A' central public sector enterprise under the Ministry of Steel, set up in 1973; runs five integrated steel plants and three special steel plants. Its 23.40 MTPA iron ore movement is one of the two freight streams the Adra bypass is designed to serve.
Coking coal producer incorporated in January 1972 after the coking coal mines were taken over by the Government in 1971; a subsidiary of Coal India Limited under the Ministry of Coal, operating in the Jharia and Raniganj coalfields. Its projection of 45 rakes per day is the second freight stream cited for the Adra bypass.
Move coal, iron ore, cement and other bulk commodities on dedicated high-capacity rail paths instead of congested mixed-traffic routes, cutting logistics cost and freeing capacity for passenger trains.
Key: One of three economic railway corridor programmes announced in the Interim Budget 2024-25 and identified under PM GatiShakti; the Adra-Joychandipahar bypass has been taken up under it.
Improve rail links between production centres and ports to speed up export-import cargo.
Key: The second of the three economic railway corridor programmes announced in the Interim Budget 2024-25.
Decongest the busiest trunk routes of Indian Railways and enable a modal shift from road to rail and coastal shipping.
Key: The third of the three economic railway corridor programmes; the package as a whole is meant to reduce the carbon footprint of freight logistics.
Integrated multi-modal infrastructure planning across ministries using a common GIS platform, so that rail, road, port and energy projects are planned together rather than in silos.
Key: The three economic railway corridor programmes were identified under PM GatiShakti; it is the planning umbrella under which the corridor projects are prioritised.
Indian Railways has 19 zones. The four sanctions touch four of them: Moradabad Division (formed 1899) is one of five divisions of Northern Railway, headquartered at New Delhi; Adra Division (formed 14 April 1961, in Purulia district of West Bengal) is one of four divisions of South Eastern Railway, headquartered at Kolkata; Samastipur Division (established 1969, Bihar) is one of five divisions of East Central Railway, headquartered at Hajipur; and Bhavnagar Division (formed 5 November 1951, Gujarat) is one of six divisions of Western Railway, headquartered at Churchgate, Mumbai.
The Adra bypass is designed around BCCL's coking coal movement from the Jharia belt - the same coalfield whose subsidence and fire problem is addressed by the Jharia Master Plan, reviewed separately by the Ministry of Coal on 1 September 2026.
Kavach is regularly paired in questions with the Dedicated Freight Corridors, the Vande Bharat programme and station redevelopment as the four planks of the current railway modernisation push.
GS Paper 3 > Infrastructure: Energy, Ports, Roads, Airports, Railways
General Awareness > Indian Railways: Zones, Divisions and Technology
General Awareness > Current Affairs and Static GK
Kavach and railway modernisation appear almost every year in Railway and SSC general awareness papers and periodically in UPSC Prelims infrastructure questions.
A signalling system that supervises the driver and applies the brakes itself if the train exceeds its permitted speed or passes a signal at danger.
A train passing a signal showing 'stop' without authority - the most common precursor to head-on and rear-end collisions, and the primary failure Kavach is designed to prevent.
Safety Integrity Level 4, the highest of the four levels of safety assurance used for railway signalling systems; Kavach is SIL-4 certified.
The length of route covered, counted once regardless of how many parallel tracks run on it - distinct from track kilometres.
Million tonnes per annum, the standard unit for freight and industrial capacity.
Accident Relief Train and Accident Relief Medical Equipment van - the rescue formations stabled at nominated yards for accident response.