The correct answer is D. 5298 km.
The North-Eastern Frontier Railway (NFR) is one of the 17 zones of Indian Railways. It is headquartered in Maligaon, Guwahati, Assam. The NFR is the largest railway zone in India in terms of area, covering 2,84,000 square kilometers. It is also the second largest railway zone in India in terms of route kilometers, with a total route length of 5,298 kilometers.
The NFR was formed on 15 August 1952, with the bifurcation of the Eastern Railway. The NFR initially had a route length of 2,400 kilometers, which was later extended to 5,298 kilometers. The NFR operates in the states of Assam, Arunachal Pradesh, Meghalaya, Nagaland, Manipur, Mizoram, Tripura, and Sikkim.
The NFR is a vital link for the people of the North-East. It provides connectivity to the region with the rest of India. The NFR also plays a major role in the economic development of the North-East. It is a major employer in the region and provides a vital transportation link for the movement of goods and people.
The NFR has a fleet of over 2,000 locomotives and over 10,000 coaches. It operates over 1,000 passenger trains and over 500 freight trains every day. The NFR is also a major player in the tourism industry in the North-East. It operates a number of tourist trains, including the Brahmaputra Mail, the Vivek Express, and the Rajdhani Express.
The NFR is a vital part of the Indian Railways. It plays a major role in the economic development of the North-East and is a vital link for the people of the region with the rest of India.