There are two UNESCO World Heritage Sites on IR viz. the Chatrapati Shivaji Terminus and the Mountain railways of India. Mountain railways of India is not contiguous, but consists of three separate railway lines located in different parts of the country viz.
- The Darjeeling Himalayan Railway, a narrow gauge railway in West Bengal
- The Nilgiri Mountain Railway, a metre gauge railway in the Nilgiri Hills in Tamil Nadu
- The Kalka-Shimla Railway, a narrow gauge railway in the Shivalik mountains in Himachal Pradesh. In 2003 the Kalka Shimla Railway was featured in the Guinness Book of World Records for offering the steepest rise in altitude in the space of 96 kilometre
Apart from that there are two lines under consideration:
- Maharaja Railways , a narrow gauge line of just 0.6m width from Gwalior to Sheopur of 198 km. in length is world’s longest narrow gauge railway line.
- Neral-Matheran Railway , a narrow gauge railway connecting Matheran is also a historic line.