This photo can be found here >> http://en.wikipedia.org/wiki/File:Roller_coaster_wheels.jpg
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On roller coaster trains, underfriction, up-lift, or up-stop wheels are a device to keep the...
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|current||16:47, April 20, 2012||1,600 × 1,200 (552 KB)||Lachlan5963||Underfriction wheels, first patented by John A. Miller. This photo can be found here >> http://en.wikipedia.org/wiki/File:Roller_coaster_wheels.jpg|