Photo taken on Sept. 4, 2013 shows a train wheel at the National Rail Museum in New Delhi, India. For more than a century, the train has been one of the most important transportation tools in India. The National Rail Museum which was opened in Feb. 1 1977, is a place showcasing the development history of Indian railway. The museum covers an area of more than 11 acres (about 44,000 square meters), displaying used locomotives, rails, wagons and special purpose vehicles. (Xinhua/Zheng Huansong)