A friend and I will be in towards the end of September 2013 and we're wondering about getting train tickets to Lhasa. We were looking at using Chinatripadvisor.com but after looking at reviews it's not 100% reliable. I will be in Xian about 7 days before we take the train to Lhasa, what will my chances be of booking a train ticket on that day? I've done quite a bit of searching on the net but can't find any recent /helpful info. If anyone can offer any advice on this it would be greatly appreciated. We are doing a tour in Tibet so our permits/visas are under control.