Longest Indian Railways flyovers coming soon! Two longest railway flyovers in the country are being built at the estimated cost of Rs 1,250 crore in the Katni district of Madhya Pradesh. These flyovers with a total length of 34.9 kilometres are being developed for the smooth movement of trains carrying coal, according to a railway official. Rahul Jaipuriyar, the Chief Public Relations Officer (CPRO) of the West Central Railway (WCR) zone was quoted saying in a PTI report that the two flyovers, one each on the up direction and down direction, are being built on the Bina – Katni – Bilaspur route under the Katni grade separation project.