<P> Three of these railways , Darjeeling Himalayan Railway , Nilgiri Mountain Railway , and Kalka -- Shimla Railway have been collectively designated as a UNESCO World Heritage Site , also named as `` Mountain Railways of India '' , while the fourth railway , Matheran Hill Railway is in tentative list of UNESCO World Heritage Site . These all are narrow - gauge railways . The Nilgiri Mountain Railway is also , the only rack railway in India . </P>
<P> Three of these railways , Darjeeling Himalayan Railway , Nilgiri Mountain Railway , and Kalka -- Shimla Railway have been collectively designated as a UNESCO World Heritage Site , also named as `` Mountain Railways of India '' , while the fourth railway , Matheran Hill Railway is in tentative list of UNESCO World Heritage Site . These all are narrow - gauge railways . The Nilgiri Mountain Railway is also , the only rack railway in India . </P>
three mountain railway lines in india which has been designated as unesco world heritage site
three mountain railway lines in india which has been designated as unesco world heritage site
Darjeeling Himalayan Railway Nilgiri Mountain Railway Kalka -- Shimla Railway
Darjeeling Himalayan Railway Nilgiri Mountain Railway Kalka -- Shimla Railway