In which year the Darjeeling Himalayan Railway is recognised as World Heritage Site by UNESCO

1. 1984
2. 1992
3. 1997
4. 1999

Answer: 1999

Explanation: Policy Circulars on Railway Heritage Preservations. Indian Railways is the proud owner of four UNESCO accorded World Heritage Sites namely Darjeeling Himalayan Railway (1999), Nilgiri Mountain Railway (2005), Kalka Shimla Railway (2008) and Chhatrapati Shivaji Terminus, Mumbai (2004).