Yes, you are allowed to transfer between departments, provided you have the approval of your supervisors and the new supervisors you'd be going to. I think you have to work in one department for 30 days before you can request a transfer, and there are no guarantees. Certainly it is done, but it is better if you try to get in the department you want the first time around!
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PO!NT OF VIEW - A Different Look at Roller Coasters
http://www.crosswinds.net/~justmayntz/thrills/