The first amusement-park roller coaster was really two roller coasters ... 

Jun 16, 1884: 

First roller coaster in America opens

 

On this day in 1884, the first roller coaster in America opens at Coney Island, in Brooklyn, New York. Known as a switchback railway, it was the brainchild of LaMarcus Thompson, traveled approximately six miles per hour and cost a nickel to ride. The new entertainment was an instant success and by the turn of the century there were hundreds of roller coasters around the country.

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This Day in History — History.com — What Happened Today in History

 

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