On Sep 18th, 2020, the Prime Minister of India, Shri Narendra Modi, inaugurated the iconic Kosi Rail Mahasetu. The railway bridge stretches to 1.9 Km long above the Kosi river. The Kosi Rail Mahasetu was constructed at an estimated cost of Rs 516 crores. The Kosi Rail Mahasetu runs parallel to the India- Nepal border. Thus, the railway bridge is considered to have strategic importance along the border.
In 1887, a meter gauge link was constructed between Nirmali and Bhaptiahi (Saraigarh). The railway bridge collapsed during the India-Nepal earthquake in the year 1934. Frequent floods and earthquakes were considered the main factors behind the collapse of the railway bridge.

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The project to reconstruct the railway bridge was finalized in the year 2003 by the former Prime Minister of India Shri Atal Bihari Vajpayee.
The construction project of the Kosi Rail Mahasetu always got delayed because of the meandering nature of the Kosi river. The construction of the Kosi Rail Mahasetu was completed after nearly 17 years. The delay in the construction of the Kosi Rail Mahasetu also happened because the meter gauge link around the railway bridge had to be replaced with a Broad gauge link.
The Kosi Rail Mahasetu is also considered an essential step towards improving the railway connectivity to India’s North East region. The railway bridge would also make travel much easier for passengers commuting between Kolkata, Delhi, and Mumbai.