The engine is backing-up. The instruction is to drive to a trackmark at the far end of the coal car consist followed by a couple. Instead AI stops the engine about 50 yards from the switch and sets it to take the engine to the wrong end of the train. It then proceeds on that wrong path at a 1mph pace. Eventually it slows to zero but pressing SHIFT reveals a slow creep with intermittent stops. When the engine gets near the "wrong coal car" it stops and no further movement is possible. There are several instances in the all AI session where similar odd behavior occurs. Track is Jarrah Procedural. No signals. With signals other odd actions occur - usually 7mph, 2mph, ans 1mph slowdowns before coupling at 5mph.