Which of the following mountain railways in India have been designated as UNESCO world heritage sites?
1. Darjeeling Himalayan Railway
2. Nilgiri Mountain Railway
3. Kalka- Shimla Railway
4. Matheran Hill Railway
1
Only 1 and 2
2
Only 1, 2 and 3
3
Only 2, 3 and 4
4
1, 2, 3 and 4
5
Only 2 and 4