Faller Gmbh
Big Dipper Roller Coaster - Working Model (Plastic Kit)

Walthers Part # 272-451
HO scale, $149.99, sold out at Walthers

 
Add an amusement park to your layout, and the Big Dipper will be the center of attention. Astonishingly similar to the real thing, this fully functional roller coaster has a 12-16V DC or AC motor that pulls cars up to the top of the run, where their own momentum carries them around the track with the help of ball bearings.