Underfriction

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]

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

References
  1. Witter, Bret (2003). Carnival Undercover. Plume. p. 113. ISBN 978-0-452-28428-9.
  2. Pleasure railway structure
  3. Cartmell, Robert (1987). The Incredible Scream Machine: A History of the Roller Coaster. Popular Press. p. 117. ISBN 978-0-87972-342-2.
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