Express bus or train?! It seem there were express bus to Qingchengshan, about one hour's drive. The Express train (D trains) ara available a coupld of months ago, only half a hour at the fatest. Ticket fare is 15RMB from Chengdu to Qingchengshan. There are many hotels, inns around the mountain, so do not worry to find a place to stay. You can find a decent one when you get there. For the mudslide, Qingchengshan was impacted a little in fact. Part of the mountain is closed. I have no idea the situation now.