- Route
- Kalka – Dharampur – Barog – Solan – Shimla
- State
- Haryana and Himachal Pradesh
- Year started
- 1903
- UNESCO status
- UNESCO World Heritage Site since 2008 – part of the Mountain Railways of India
The Kalka–Shimla Railway is one of India's best-known mountain railways and a remarkable example of engineering through difficult Himalayan terrain.
The narrow-gauge railway climbs from Kalka toward Shimla through steep hills, deep valleys and mountain settlements.
Its route is particularly famous for its large number of bridges and tunnels. Barog Tunnel is among the best-known structures along the line.
The railway historically played an important role in connecting Shimla with the plains when the hill city served as the summer capital during British rule.
Today, the route remains operational and is particularly popular with tourists because of its scenic landscapes, old stations and heritage railway atmosphere.
UNESCO added the Kalka–Shimla Railway to the Mountain Railways of India World Heritage property in 2008.