Dual-tracked roller coaster
A dual-tracked roller coaster is a roller coaster that consists of two tracks. They can be configured as racing, dueling, or Möbius loop roller coasters. Some dual-track coasters operate only one track side at a time, including Rolling Thunder and Colossus. Others may opt to run one side facing frontward and one side facing backward.
Riders slap hands on the Racer at Kennywood
A roller coaster is a type of amusement ride employing a form of elevated railroad track that carries passengers on a train through tight turns, steep slopes, and other elements designed to produce a thrilling experience. Trains consist of open cars connected in a single line, and the rides are often found in theme parks around the world. Roller coasters first appeared in the 17th century, and LaMarcus Adna Thompson obtained one of the first known patents for a roller coaster design in 1885, based on the Switchback Railway which opened a year earlier at Coney Island.
The Scenic Railway at Luna Park, Melbourne, is the world's second-oldest operating roller coaster, built in 1912.
The Promenades-Aériennes in Paris, 1817
Thompson's Switchback Railway, 1884
Steel Force (left) and Thunderhawk (right), two roller coasters at Dorney Park & Wildwater Kingdom in Allentown, Pennsylvania. Steel Force is the eighth longest steel roller coaster in the world.