astroboy - do you know how long the overnight trains take? and do they leave at convenient times e.g. leave 8pm, arrive 10am?
I had friends that did it as a day trip. Flew down in the morning, got picked up at the airport, taken to the warriors, then to the muslim quarter, back to the airport and flew back to beijing. Far from ideal but they only had one day, wanted to see them and figured it was worth the money. They arranged it through a travel agent. If you are interested pm me and I can send you the email of my travel agent (who speaks english) and you can ask her if she can arrange something like that for you. No idea about the cost.

