There are 2 forms you need to download and fill out before the trip. One is teh standard waiver that all companies require. Ensure all parties with you sing it.
You may download it HERE.
The other is a medical form. This you need to fill out and provide it to the Wagon Master in a sealed envelope. He will retrun ti at the end of the trip unless it has had to be opened in an emergency. You may download it HERE