Just returned from Waterloo, where oldest son was finishing up a summer internship job in Drivetrain Quality Control, analyzing gears. I highly recommend the tours. I toured Engines and also Drivetrains. I wish I had time to tour Cab Assembly, I think that's where they actually assemble the tractors. In Waterloo they are building the biggest JD tractors, the 9000's, 8000's 7000's. Just a personal recommendation, we had difficulty finding a good restaurant until the last day, found a really good one at the corner of Highway 63 and Ridgeway. Just go online and get the phone numbers to make your reservations. Free. Tours are ride-along all thru the factory; no walking required.