•The Nilgiri mountain the Darjeeling Himalayan railway and The Kalka Shimla railway callectively got the status of world heritage sites in 1999 .
•the Darjeeling Himalaya railway( West Bengal )was opened in 1881.
•the formation of the Nilgiri mountain railway a 46- km long metre gauge single railway track was completed in 1908.
• the 96 km long single track of the Kalka Shimla railway opened for traffic on November 9 ,1903 .
