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After the Government of India took over the management of EIR in 1925 ,this  along with GIP Railway were the first to be organised into divisions. Initially there were six divisions in EIR — Howrah, Asansol and Dinapore were known as the lower divisions and Allahabad Lucknow and Moradabad were known as the upper divisions.

Gradually, the railway systems all over India started getting reorganized. The reconstitution and regrouping of 42 railway systems consisting of 13 Class I, 10 Class II and 19 Class III railways plus 32 state owned lines was a mammoth task undertaken by the Government of India after 1948. In 1944, the Government had acquired control of all the railways except a very few privately owned light railways. The final plan of reorganization was approved by the Central Advisory Council for Railways in December 1950.

In 1951-52, six zones were formed initially, namely Northern Railway, Southern Railway, Eastern Railway, Western Railway, Central Railway and North Eastern Railway. The three Upper divisions of E.I.R. were added to Eastern Punjab Railway, Jodhpur Railway and Bikaner Railways to form the Northern Railway.

Eastern Railway comprised the remaining lower divisions of Howrah, Asansol and Dinapore and also had an addition in Sealdah division which had been formed from the truncated part of B & A Railway. The Bengal Nagpur Railway was also added to EIR. This amalgamation led to the creation of Eastern Railway on the 14th of April 1952.

Thus was reached a very important landmark in the history of the Indian Railways – the culmination of a long process spread over several decades.