Darjeeling Mail has a connecting Toy Train which departs NJP at 09.00 hrs reaching DJ at 15.30 hrs. As for Kanchenjunga, Sikkim has no Railway lines.
On the other hand Mayurakshi River has Dam in Massanjore in Dumka region of Erstwhile West Bengal (Now Jharkhand). Massanjore Dam is maintained by WB Govt Water & Irrigation department under WB Irrigation Minister.