Originally 107 tunnels were built on Kalka Shimla Railway Track. In 1930 they were renumbered and four of them were discarded so only 103 were left. In 2006 tunnel number 46 was dismantled so presently only 102 are in use. But tunnel number 103, the last tunnel in Shimla, is still famous as tunnel number 103 as this place has become a famous landmark of the town.