RRB Practice 14

The Konkan Railway is one of the most ambitious and technically challenging railway construction projects completed in post-independence India, connecting Roha in Maharashtra to Thokur near Mangaluru in Karnataka over a route length of approximately 741 kilometres through some of the most difficult terrain on the western coast of the Indian subcontinent. The Konkan coast is characterised by the Western Ghats running parallel to the sea at a short distance inland, with numerous rivers and streams flowing westward from the ghats to the Arabian Sea, creating a landscape of deep valleys, rocky headlands, dense forests, and laterite plateaus cut through by deep river gorges. The Konkan Railway Corporation, established in 1990 as a special purpose vehicle with equity participation from the Governments of India, Maharashtra, Karnataka, and Goa, was given the mandate to construct and operate this railway, raising finance through bonds and other instruments rather than relying solely on budgetary allocations. The construction of the Konkan Railway involved the construction of approximately 91 tunnels with a combined length of over 82 kilometres, and 179 major bridges crossing the numerous rivers and streams along the route. The Panval Viaduct in Maharashtra, with a height of approximately 64 metres and a length of 424 metres, is among the most impressive structures on the route, carrying the railway across a deep valley on a graceful series of concrete piers. The Sharavathi Bridge and the Zuari Bridge in Goa are other notable structures demonstrating the engineering skill of the project. The geological complexity of the region, involving alternating hard basalt and soft laterite rock, frequent encounters with cavities and springs in the tunnels, and the presence of highly weathered rock requiring extensive support, made tunnelling particularly challenging and required constant adaptation of construction methods. Monsoon management was a critical challenge throughout the construction period, as the Konkan coast receives among the highest rainfall in India, with some locations recording over 3,000 millimetres annually, making outdoor construction work impossible for several months of the year and creating flooding and slope instability hazards. The railway line was opened in phases between 1993 and 1998 and is operated by the Konkan Railway Corporation, which also provides maintenance services under agreement to other railways. The Konkan Railway introduced several safety innovations to Indian Railways, including the anti-collision device known as the Raksha Kavach, which automatically applies brakes to prevent collisions between trains on the same line. The train management system on the Konkan Railway uses token-less block working with electronic interlocking to control train movements safely through the numerous tunnels and single-line sections. The railway has had a transformative impact on the economy of the Konkan region, enabling faster movement of people and goods and opening up previously isolated communities to wider economic opportunities, though it has also faced criticism regarding its environmental impact on the sensitive coastal ecosystem of the Western Ghats.