Changing India PM Modi inaugurates 'Kosi Rail Mahasetu', slew of rail projects for Bihar Updated : September 19, 2020 12:33 AM IST Bihar Chief Minister Nitish Kumar and his deputy Sushil Modi were also present during the virtual event. The Kosi Rail Mahasetu (mega bridge) is 1.9-km long and its construction cost is about Rs 516 crore. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.