Here is the same thing, which they just call “background scroller” built using the following materials:
1 DC motor from a Pixima i1500 inkjet printer plus the belt drive and gears
2 1/4 inch wooden dowels for inner (slower) axel pegged at top with metal pins
2 toilet paper rolls for outer (faster) axel strengthened with wooden inserts
A large sheet of heavy-duty art paper on which a themed background is drawn
A sheet of clear contact paper to provide scroll stiffness and strength
Many bamboo skewers cut and glued to the scroll for train track sections
What I want to make is just the small motorized scrolling background, not the complex interactive coin-operated thingamajig they made in Escape from Sagebrush Gulch.