Discovered today at the StaMart Travel Center in Fargo, North Dakota. They have a Stern Roller Coaster Tycoon that, in spite of being filthy, played pretty good. All lamps worked and the flippers were powerful. I had to re-calibrate my shots though because of the lack of Super Bands, Saturn flipper rubbers or for that matter, well, look at the pictures.....
Also note that the upper flippers were fine.