Here's a picture of a 1867 Steam Roper. Of course this is a replica of the original. If i remember this replica is some where here in the Northeast.
Years ago in Easyriders Magazine they featured a bike called The Harley Davidson Steam Flyer.
The one you posted looks less likely to kill ya than the one in Easyriders.
Cool StBobber, and I have been to Lewistown, PA many times. Never saw this though...