Where is the railway ticket office in Beijing Shoudu? Is there a map that I can print out?

Hi,
I have been told there is a place I can pick up my prepaid railway ticket in the airport, but I don't know where it is. Being the pre-New Year rush, I think it would be best to pick up my ticket at the airport before going to the train station.

Is there a map that I can download and print out showing the location of the office?

Thanks for your help.