Kashmir Railway - Infrastructure and Construction

Infrastructure and Construction

The Kashmir Railway is perhaps the most difficult new railway line project undertaken on the Indian subcontinent by government of India. The terrain passes through the young Himalayas, which are full of geological surprises and numerous problems. The alignment for the line presents one of the greatest railway engineering challenges ever faced, with the only contest coming from the Qingzang Railway in Tibet that was completed in 2006 and crosses permanently frozen ground and climbs to more than 5,000 m (16,000 ft) above sea level. While the temperatures of the Kashmir Railway area are not as severe as Tibet, it does still experience extreme winters with heavy snowfalls. However, what makes the route even more complex is the requirement to pass through the Himalayan foothills and the mighty Pir Panjal range, with most peaks exceeding 15,000 ft (4,600 m) in height.

The route includes many bridges, viaducts and tunnels. The railway is expected to cross a total of over 750 bridges and pass through over 100 km (62 mi) of tunnels, the longest of which is about 11 km (6.8 mi) in length. The greatest engineering challenges involve the crossing of the Chenab river, which involves building a 1,315 m (4,314 ft) long bridge 359 m (1,178 ft) above the river bed, and the crossing of the Anji Khad, which involves building a 657 m (2,156 ft) long bridge 186 m (610 ft) above the river bed. The Chenab Bridge will be the highest railway structure of its kind in the world, 35 m higher than the tip of the Eiffel Tower in Paris. Both bridges are to be simple span bridges. Cor-Ten Steel is planned to be used to provide an environment friendly appearance and eliminate the need to paint the bridge. The design and structure is very similar to the New River Gorge Bridge. The project is being managed by the Konkan Railway Corporation. Completion is scheduled for 2012, four years after the first isolated section of the route was opened for local passenger services, and it requires the use of 26,000 t of steel.

All tunnels including the New Banihal Tunnel will be constructed using the New Austrian Tunneling method. Numerous challenges have been encountered while tunneling through the geologically young and unstable Shivalik mountains. In particular water ingress problems have been seen in the Udhampur to Katra section. This has required some drastic solutions using steel arches and several feet of shotcrete.

Even though the line is being built through a mountainous region, a ruling gradient of 1% has been set to provide a safe, smooth and reliable journey. More importantly bankers will not be required, making the journey quicker and smoother. It will be built to the Indian standard broad gauge of 1,676 millimetres (5.499 ft) gauge, laid on concrete sleepers with continuous welded rail and with a minimum curve radius of 676 m. Maximum line speed will be 100 kilometres per hour (62 mph). Provision for future doubling will be made on the major bridges. Additionally provisions for future electrification will be made, though the line will be operated with diesel locomotives initially, as Kashmir is an electricity scarce region at present. There will be 30 stations on the full route, served by 10–12 trains per day initially.

The Kashmir line will connect with the Indian Railways railhead at Jammu, where a 55 km access route has been built to Udhampur.