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  The three basic styles of wooden track roller coasters are shown below along with their wheel arrangements  
  Side friction wood track  
Side Friction style track used wheels that ran along a board on the side of the track to keep it from flying off the track, however there was no way to keep the trains from lifting off the track. Side Friction coasters were once very common in the early days of roller coaster construction, now only one is still in operation in the U.S. Leap the Dips is located at Lakemont Park in Altoona, Pennsylvania.
  Standard laminated wood track  
The most common type of wood track construction today employs this standard laminated track. A strip of metal is layed down over several layers of laminated wood, the wheels travel on the strip of metal. A set of side friction wheels run on the inside of the laminated wood to keep the train from sliding off track. The under friction wheels are what changed the way coasters would be built for ever. Patented by John Miller in 1912 the under friction wheels prevented the lifting of the train off the track allowing for steeper drops and eventually inversions.
  Flanged wheel wood track  
Some wooden coasters use flanged wheels, similar to those found on rail road trains. The flanged wheels run along the running rails, while the under friction bars keep the train from lifting off thr track.




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