Amusement parks often feature multiple roller coasters of primarily timber or steel construction. Fundamentally, a roller coaster ride is one in which a specialized railroad system with steep drops and sharp curves, passengers sit and are restrained in cars, usually with two or more cars joined to form a train. Some roller coasters feature one or more inversions (such as vertical loops) which turn the riders upside down. Over the years there have been many roller coasters manufactures with a variety of types of roller coasters.
A roller coaster is a type of amusement ride that employs a form of elevated railroad track designed with tight turns, steep slopes, and sometimes inversions.People ride along the track in open cars, and the rides are often found in amusement parks and theme parks around the world. LaMarcus Adna Thompson obtained one of the first known patents for a roller coaster design in 1885, related to the Switchback Railway that opened a year earlier at Coney Island. The track in a coaster design does not necessarily have to be a complete circuit, as shuttle roller coasters demonstrate. Most roller coasters have multiple cars in which passengers sit and are restrained. Two or more cars hooked together are called a train. Some roller coasters, notably wild mouse roller coasters, run with single cars.