Underfriction

File:Roller coaster wheels.jpg

A roller coaster wheel assembly. The underfriction wheels are on the bottom. The three sets of wheels clamp onto the track.

On a roller coaster train, the underfriction, up-lift, or up-stop wheels are a device to keep the train from jumping off the track under intense movement.^[1] The design was patented in 1919 by John A. Miller.^[2]^[3]

References

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[1] Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).

[2] Pleasure railway structure

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v t e Roller coasters
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Overview	Elements History Manufacturers Physics Rankings Types	File:Dorney Park Steel Force Thunderhawk.jpg
Technology	Brake run Inversion Vertical loop Launch track Rollback Lift hill On-ride camera Single-rail Stadium seating Station Train Underfriction Wheel assembly	File:Dorney Park Steel Force Thunderhawk.jpg
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Underfriction

References

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