The correct answer is D. Guwahati.
The North-Eastern Frontier Railway (NFR) is one of the 17 railway zones of Indian Railways. It is headquartered in Guwahati, Assam. The NFR is responsible for the operation of railway services in the northeastern states of India. It has a total route length of over 2,000 kilometers and operates over 1,000 trains daily.
The NFR was formed on 15 August 1952, by merging the Assam Railway and Avadh-Tirhut Railway. The first train on the NFR ran from Dibrugarh to Tinsukia in 1881. The NFR has played a vital role in the development of the northeastern region of India. It has helped to connect the region with the rest of the country and has also promoted trade and commerce.
The NFR is a major employer in the northeastern region. It has over 100,000 employees. The NFR is also a major contributor to the economy of the northeastern region. It generates over Rs. 10,000 crore in revenue annually.
The NFR has been facing a number of challenges in recent years. These include the insurgency in the northeastern region, the natural disasters that frequently hit the region, and the financial crisis that has affected the Indian Railways. However, the NFR has been able to overcome these challenges and continue to provide a vital service to the people of the northeastern region.
Here is a brief explanation of each option:
- Option A: Kolkata is the capital of West Bengal and the second most populous city in India. It is not the headquarters of the North-Eastern Frontier Railway.
- Option B: Hajipur is a city in Bihar. It is not the headquarters of the North-Eastern Frontier Railway.
- Option C: Gorakhpur is a city in Uttar Pradesh. It is not the headquarters of the North-Eastern Frontier Railway.
- Option D: Guwahati is the capital of Assam and the largest city in the northeastern region of India. It is the headquarters of the North-Eastern Frontier Railway.