Yes, you can pick up tickets you order on ctrip at any station window. There's a 5RMB fee per ticket when you pick up tickets in a different city than the departure city, though.

You can also buy tickets at the small ticket offices scattered throughout all Chinese cities. There's a 5RMB fee at these small offices, too, regardless of departure point. But unlike station ticket offices, almost never any lines. Bring your passport!