> Is it structural? Yes, the cars' weight rests on the end of each axle via a "b... | Hacker News

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Lammy on Aug 29, 2021 | parent | context | favorite | on: Train Wheels Are Cones

> Is it structural?

Yes, the cars' weight rests on the end of each axle via a "bogie" that holds the suspension and brakes and such, and then the multi-axle bogie itself rotates on a center pin:

https://en.wikipedia.org/wiki/Bogie#Components

https://en.wikipedia.org/wiki/List_of_railroad_truck_parts#A...

CRConrad on Aug 30, 2021 [–]

But that doesn't explain why the wheels are rotationally fixed to each other by an axle.

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