Clips of trains driving through a gigantic LEGO Train Track System, with the camera being mounted on the trains. This makes a detailed explanation of the train track system possible.
Except for the elevator sequence at 2:45, the original speed is unchanged! (although, sometimes the speed of the trains seems to be unrealistic fast, it's the original speed due to double motors, many straights, curves with large radius, and bridge descents)
The trains drive through a LEGO train track setup with 400m tracks, big bridges including a suspension bridge, as well as an automated train elevator and automated switches.
More videos of that train track setup: ruclips.net/p/PLG1_YWsshyRSg4iVEKI7lgUOeRArV-...