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Transit? Agreed. Freight + heavy haul, though, will often use above floor truing machines (lathes or milling) that require the wheel sets be removed - granted, other actions are also likely being performed to the wheel set components.
Here's a surface (or above floor) wheel lathe in action: https://www.youtube.com/watch?v=uRqeKL5VsjI
And while not a lathe, here's an underfloor wheel truing machine that might be in use in that wheel shop: https://www.youtube.com/watch?v=Ip1VUnQPVhE