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The Kalka–Shimla Railway is a historic narrow-gauge mountain route famous for tunnels, bridges and Himalayan scenery.
The Kalka–Shimla Railway opened in 1903 and connects Kalka with the hill city of Shimla.
The line was constructed through challenging Himalayan foothill terrain and required numerous tunnels, bridges and sharp curves.
Its historic stations and engineering structures have made it one of India's best-known heritage railway journeys.
In 2008, UNESCO added the Kalka–Shimla Railway to the Mountain Railways of India World Heritage property.
India's passenger railway history began on 16 April 1853 with a historic journey between Bombay and Thane.
Electric railway operation in India began in 1925 with a suburban service between Bombay VT and Kurla.
The standard broad-gauge railway track used across most of Indian Railways measures 1,676 millimetres.
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