Pakistan Railway
1942 January 1st. The Assam-Bengal Railway combined with the Eastern Bengal Railway to form the Bengal and Assam Railway.
1947 At time of the independence of India, the Bengal and Assam Railway was split up and the portion of the system, about 2,603.92 km long, which fell within the boundary of erstwhile East Pakistan was named as Eastern Bengal Railway, the control remaining with the central Government of Pakistan.
On 1 February 1961, the Eastern Bengal Railway was renamed as the Pakistan Railway
1962 it became the Pakistan Eastern Railway. With the emergence of Bangladesh, it became the Bangladesh Railway.