Look up the bike shop in Defiance, MO. There is only one. They started doing supported trips on the Katy and they run a shuttle service.

It is an outstanding trail. Some parts are better than others but it's all good. I ride the east end but that's where I live. The Katy is a great place to get away from it all for a couple of hours or a week. Yes, it can be dusty. I just hose down my bike with the hose nozzle set to a gentle spray after a ride.