Hi David,
It's a bit long winded, but if you have the patience download Dias Costa's index application see this thread: **LINK**
Once you have that search for steam engine construction series mentioning wheels later than 2001 in the Model Engineer Index.
Assuming you have aan ME subscription, you can then download the articles in question from the online archive. The descriptions there are better than Icold do, having only machined cast flywheels and loco wheels from solid steel blanks, which are much different processes.
Neil