The correct answer is: A. 15th January, 1958
The North Eastern Frontier Railway (NFR) is one of the 17 railway zones of Indian Railways. It is headquartered in Maligaon, Guwahati, Assam. The NFR was established on 15 January 1958, by bifurcating the Assam Railway from the Eastern Railway. The NFR is responsible for operating the railway network in the northeastern states of India, including Assam, Arunachal Pradesh, Nagaland, Manipur, Mizoram, Tripura, Meghalaya, and Sikkim. The NFR has a total route length of 2,848 km, of which 2,293 km is broad gauge and 555 km is meter gauge. The NFR operates a fleet of over 2,000 locomotives and over 10,000 coaches. The NFR is a vital link for the northeastern states of India, and it plays a key role in the economic development of the region.
Option B is incorrect because the North Eastern Frontier Railway was established on 15 January 1958, not 15 January 1955.
Option C is incorrect because the North Eastern Frontier Railway was established on 15 January 1958, not 2 January 1956.
Option D is incorrect because the North Eastern Frontier Railway was established on 15 January 1958, not 14 April 1952.