The chain should have been named Sealdah-Saharanpur-Dehradun Super Chain. Therefore it is now so named. Using the chain one can travel from Kolkata to Dehradun on Sundays and Wednesday. It is mostly a super fast chain. On Wednesdays and Sundays Dehradun bound Doon Express leaves Howrah. But if you travel in Doon Express you have to spend two nights in the train. But if you use this chain, you have to spend only one night in the train. This train also enables you to travel from Sealdah to Dehradun.