With an objective for the expansion of Railway network, contemplating on the concept of socio-economic development in N. E. Region adjoining the seven sisters viz. Assam, Arunachal Pradesh, Nagaland, Mizoram, Meghalaya, Tripura and Manipur through railway connectivity as a part of Government policy Construction Organization in N. F. Railway was set up in the year 1979 and since then this organization achieved many milestones and striving hard for attaining