Kangra Valley Railway is the mountain toy train that carries passengers from Pathankot in Punjab to Joginder Nagar in Himachal Pradesh.
Nilgiri Mountain Railway has the steepest track in Asia. It runs from Mettupalayam to Ooty via Coonoor.
Darjeeling Mountain Railway was built in 1881 and carries passengers from New Jalpaiguri to Darjeeling Bazaar.
The most iconic Kalka-Shimla Railway runs from Kalka to Shimla and has more than a hundred tunnels.