• Source: 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. The design was patented in 1919 by John A. Miller.




References

Kata Kunci Pencarian:

• Underfriction
• Side friction roller coaster
• Roller coaster
• History of the roller coaster
• Wooden roller coaster
• Roller coaster train
• Kennywood
• Racer (Kennywood)
• Roller coaster wheel assembly
• John A. Miller