Mountain Railways of India refer to the railway lines built in the mountains of India in the nineteenth and early twentieth century, during the British Raj, even being run today by the Indian Railways. How many railway lines refer to the Mountain Railways of India ?

The correct answer is C. 5.

The Mountain Railways of India are a group of five railway lines built in the mountains of India in the nineteenth and early twentieth century, during the British Raj, even being run today by the Indian Railways.

The five railway lines are:

• The Darjeeling Himalayan Railway, which runs from New Jalpaiguri to Darjeeling in West Bengal.
• The Kangra Valley Railway, which runs from Pathankot to Joginder Nagar in Himachal Pradesh.
• The Matheran Hill Railway, which runs from Neral to Matheran in Maharashtra.
• The Nilgiri Mountain Railway, which runs from Mettupalayam to Ooty in Tamil Nadu.
• The Kalka-Shimla Railway, which runs from Kalka to Shimla in Himachal Pradesh.

These railway lines are all UNESCO World Heritage Sites and are known for their scenic beauty and engineering feats.