Instead of regular upstop wheels, what are known as mushroom bolts keep the cars on track. A flat, freely spinning steel disc is slotted below two spaced rails on the track and bolted to the bottom of the cars.

Wild Mouse

Wild Mouse

12 July, 2004 by Richard Wilson

Instead of regular upstop wheels, what are known as mushroom bolts keep the cars on track. A flat, freely spinning steel disc is slotted below two spaced rails on the track and bolted to the bottom of the cars.

In this photo