Which of the following statements about The Mountain Railways of India which comprises Darjeeling Himalayan Railway, Kalka Shimla Railway and Nilgiri Mountain Railway and is listed as UNESCO World Heritage Site is/are correct? I. Darjeeling Himalayan Railway which started in 1881 is the oldest II. Kalka Shimla Railway covers the longest distance among the three trains III. Darjeeling Himalayan Railway was in news recently for announcing a shift from steam to diesel locomotives
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