Side Friction Coaster

Before the invention of "upstop wheels", coaster cars and trains weren't attatched to the track by anything other than gravity. A side friction coaster is any wooden coaster where the car is essentially in a kind of trough, with wheels underneath and to the side. The side wheels stop the car from grinding to a halt as it goes around a corner.

Today, there are two main types of Side Friction coaster, Figure Eight, or "Bobsled" coasters and Water Chutes. You'll be hard pushed to find either, but they are around.

While Scenic Railways are a form of side friction coaster, they are covered elsewhere.