1885 78 miles in operation
1947 At time of the independence of India, the Bengal and Assam Railway was split up. The portions of the Bengal Assam Railway which lay in Assam and the Indian part of North Bengal became the Assam Railway.
1952 The North Eastern Railway was formed by amalgamating the Assam Railway with the Oudh Tirhut Railway and Fatehgarh district of the Bombay, Baroda and Central India Railway.
1958 The Northeast Frontier Railway was carved out of North Eastern Railway.