Here's a short video that shows exactly what it is doing. In this video, it sits still, but chuffs and puffs smoke as if it's rolling. It starts out at 1 mph, and then I gradually increase it to 2, 3, 4, and it finally lurches into reverse at 5 mph. If you look closely at the video, you'll see that the flywheel is not turning while it is smoking and chuffing while sitting still. It does the same thing in forward; I just happened to get a good video capture of it in reverse.
I took the advice here and ran it for an hour, varying the speed between 30 and 35 mph. I did this for an hour in forward, and again in reverse. This video was taken after those 2 "break-in" runs, so there is clearly something else going on here.
