From Kolkata to Kalka / Chandigarh to Shimla.
From Howrah station in Kolkata you can go to Kalka by Kalka Mail train. The fare of Kalka Mail is AC three-tier Rs. 2350 per person. 2250 per person. From there there is a train called Burmese Kalka Mail to Kalka. You can go to Kalka by buying a ticket from Ambala