Underfriction

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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

  1. ↑ Script error: No such module "citation/CS1".
  2. ↑ Pleasure railway structure
  3. ↑ Script error: No such module "citation/CS1".

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