Magnum XL-200
Like all modern coasters, Magnum is securely locked onto the track and has wheels situated above, below, and beside the rails. But surprisingly, the wheels below the track (known as the "under-wheels" or "up-stop wheels") were added after Magnum XL-200 opened! Magnum's trains originally had pads under the track, but the cars were quickly modified to replace the pads with wheels. The Cedar Creek Mine Ride and Gemini, which also were built by Arrow Dynamics, have pads under the track even to this day.
©2017 by Joel A. Rogers.