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by thspimpolds 1746 days ago
They are also pressure fitted onto the axles. They are not bolted or otherwise fixed. The only thing which keeps them on the train is friction and the rail itself.

I was on a commuter train which derailed because it LOST a wheel. I don't understand why they aren't at least locked in mechanically. That wheel went rolling at 80MPH and blasted straight through trees near the tracks.