The wheels also have to have the right size to not get resonance. This have been a problem in Norway when the train reach 200km/h, because they forgot (?) to fa

The wheels also have to have the right size to not get resonance. This have been a problem in Norway when the train reach 200km/h, because they forgot (?) to factor this in. This feels like a really bumpy road at high speed, and stop if the train driver reduce the speed just a little bit.