A FOND DE TRAIN - C'est Pas Sorcier

But how do trains manage to go so fast? The "It's Not Rocket Science" truck pulls into the station and lets Fred take the controls of the most spectacular locomotives to understand how, in a century and a half, we went from narrow-gauge trains to high-speed trains. How do a steam locomotive and an electric locomotive work? How does the train stay on its tracks? How does it stop?