The Indian Railways has invited bids for about 15,000 km, covering the Golden Quadrilateral, Golden Diagonal, and other high-density routes, of which contracts for 14,954 km have been awarded for implementing the latest version of the indigenously developed Automatic Train Protection (ATP) system – Kavach version 4.0.

South Central Railway (SCR), which had earlier deployed Kavach version 3.2 on 1,465 km, played a key role in its development and subsequent improvements, Railways Minister Ashwini Vaishnaw informed the Rajya Sabha.