The train

I've seen exactly one episode of this show. In the one I saw, they were trying to get a circle to take its place as the steering wheel on a train, because the train was approaching a curve in the tracks and it needed the steering wheel to turn.

The problem is, trains don't have steering wheels, they follow the the tracks. There is no need to turn a steering wheel when it comes to a curve.

I'm sure some people here will consider this nitpicking, but it seemed really odd to me that a supposedly educational show would include something so blatantly wrong.