Steel changes what a coaster can do
Wooden coasters are built from timber supports with flat steel straps on top of the wood. They can be thrilling, but wood has limits: it flexes, needs constant maintenance and cannot be shaped into tight, precise curves. The step that changed this was the move to tubular steel track in the 1950s. This article covers that shift and the loops that followed, leaving the earlier history of ice slides, Coney Island and the wooden boom to our overview of the ride.
Early loops that did not last
Loops are older than most people assume. A “centrifugal railway” in Paris is reported in the 1840s, and in the 1890s and early 1900s American builders tried circular loops at Coney Island. The Flip Flap Railway of 1895 is often named, along with Edwin Prescott’s Loop the Loop, which appeared around 1901. These used loops close to perfect circles.
A circle is hard on the body. To keep a train moving through the top of a circular loop, the train must enter very fast, and the bottom of the circle then pushes riders hard into their seats. Reports from the period describe neck strain and complaints, and the rides did not remain popular. Modern designers learned the lesson, but it took better materials and better calculation.
The Matterhorn and tubular steel
In 1959, Disneyland opened the Matterhorn Bobsleds, widely described as the first roller coaster built with tubular steel track. Arrow Development, the company behind the design, built track from steel pipes that could be bent and welded into smooth curves. The cars rode on wheels that held the pipe from several sides, so the train was less likely to lift off the rails.
Compared with a wooden structure, steel track could be manufactured in a factory to repeatable standards and then assembled on site. Builders could use metalworking techniques such as bending and welding to shape complex curves. Later, steel supports became standard for most new tall rides, though wooden coasters kept their own devoted fans.
Polyurethane wheels also helped. They run more quietly than steel wheels and give a smoother ride, which let designers use higher speeds and tighter transitions.
The modern vertical loop
Loops returned in the 1970s. In 1975, Knott’s Berry Farm in California opened the Corkscrew, built by Arrow and usually described as the first modern coaster to turn riders upside down. A year later, in 1976, Magic Mountain in California opened Revolution, often described as the first modern coaster with a vertical loop. It was associated with the German designer Anton Schwarzkopf, whose firm had worked on loop designs earlier. Claims of “first” vary depending on whether a ride is judged by its track, its loop or its place in America, so it is safer to say that these rides launched the modern era.
The key improvement was shape. Instead of a circle, designers used a teardrop, often called a clothoid loop, with a tighter curve at the top and a gentler curve at the bottom. The rider enters the base with strong forces for a short moment, then passes over the top with less of a curve. Engineers credit the teardrop with making loops more comfortable and more practical. Credit for the design is commonly given to a German engineer, Werner Stengel, though other designers worked in the same area.
Trains, restraints and safety
Inversions require restraints that hold riders firmly. Over-the-shoulder harnesses became common on looping rides, and later lap and vest restraints and better seat shapes were developed. Parks and regulators developed inspection practices, and ride designers rely on measured forces rather than guesswork, which makes this a story of engineering practice rather than pure thrill-seeking. Calculations once done by hand and slide rule moved onto electronic computers, so designers could test a layout before building it.
Bigger, faster, stranger
Once steel track and loops were established, parks competed on height, speed and variety. Later designs added launches using electric motors instead of a chain lift, along with inverted trains hanging beneath the track and floorless cars. Some rides now add VR headsets to the experience, though how common that is varies by park.
Record claims shift every few years as new rides open, so any “tallest” or “fastest” title is only temporary, and a reader should check a current source. What has remained constant is the basic bargain of the looping coaster: very controlled forces, delivered in a way that feels wild.