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I know about the need to change wheels! My parents both worked for the railway, so this is common knowledge in our family and we often talked about it. Also when they were young they travelled to Moscow by train which took several days I believe. At the way home they were late for their own engagement party, which was had by the parents all by themselves.

I had no idea the wheel changing was done with the people still inside though! Very interesting! I don't know what I expected - people getting out and standing around in the cold waiting?