I called them to ask about evening train for a friend to Guangzhou-they said they had 11:50pm, nothing earlier. So my friend went down to get the ticket the next day asking the time, and the girl said 11:50 pm as well. Turns out the train was for the morning and she didn't realize it till too late (it was printed on the ticket but she forgot they use military time).
Anyway, my friend ended up getting a free ticket for the next morning after making a scene. They interviewed her and took her photo receiving the ticket for the railway paper- this was on 8-8-08.
Also, often they don't have tickets that the train station will.