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.So this 96 km long narrow-gauge track that passes through 102 tunnels and across more than 800 bridges and viaducts, is one of the most beautiful hill railways in India. It was considered the 'crown jewel' of the Indian National Railways during British times.