The Nilgiri Mountain Railway is a railway in Tamil Nadu, India, built by the British in 1908, and was initially operated by the Madras Railway. The railway still relies on its fleet of steam locomotives. NMR comes under the jurisdiction of the newly formed Salem Division. In July 2005, UNESCO added the Nilgiri Mountain Railway as an extension to the World Heritage Site of Darjeeling Himalayan Railway, the site then became known as "Mountain Railways of India." After it satisfied the necessary criteria, thus forcing abandonment of the modernisation plans. For the past several years diesel locomotives have taken over from steam on the section between Coonoor and Udhagamandalam. Local people and tourists have led a demand for steam locos to once again haul this section. The famous Hindi song "Chaiyya Chaiyya" from the film "Dil Se" featuring Shahrukh Khan was shot on the roof top of NMR.
As of 2007, there is one train a day over the rack section, which starts from Mettupalayam at 07:10 and reaches Ooty at noon. The return train starts from Ooty at 15:00, and reaches Mettupalayam at 18:35. The train is scheduled to connect to the Nilgiri Express, which travels from Mettupalayam to Chennai via Coimbatore. A summer special service is also run during the months of April and May, starting from Mettupalayam at 09:30 and from Ooty at 12:15. Between Coonoor and Udagamandalam, there are four daily trains each way.