Underfriction Explained

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]

References

  1. Book: Witter . Bret . Carnival Undercover . 2003 . Plume . 978-0-452-28428-9 . 113 . en.
  2. Book: Cartmell . Robert . The Incredible Scream Machine: A History of the Roller Coaster . 1987 . Popular Press . 978-0-87972-342-2 . 117 . en.

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