Go to irctc.co.in
And, From = DJ (Darjeeling) To = DJRZ (To Darjeeling) Date = What you want and press search. You will find 2 type options First is Diesel Joy Ride which costs = 1,000/- and Second is Steam Joy Ride which costs = 1,500/- select and go for payment and after you have ticket for enjoy darjeeling beauty.