When the Burlington Northern diesel repair shop was built in 1978 at Alliance, NE, a wheel truing/trimming machine was purchased from a German concern and installed. The locomotive was spotted up on the machine and the wheels were turned by the machine and trimmed with huge tool bits. The shavings were carried away by conveyor and dumped into a gondola spotted outside the shop building. So far as I can recall, there was no heat treatment involved, but that was almost 30 years ago so newer technology may well have been applied by now.
You can't go home again- Thomas Wolfe