Elon Musk's Loop tunnel relies on century-old roller coaster tech

The wooden Leap-the-Dips amusement park ride in Altoona, Pennsylvania, is the oldest roller coaster still running in the United States. Built in 1902, it became a National Historic Landmark in 1996. It's known as a side-friction roller coaster, a type so outmoded that only a handful of vintage amusement parks worldwide still have one. The key to the ride is a set of wheels that roll and bounce against a vertical plane to keep the cars on their track.
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