This could be sub-titled... "Re-inventing the Wheel" The Scullin design, invented by Harry Dreibuss, was an attempt to create disc-centers that did not suffered from the strength problems that arose from previously designed "hollow", disc-centers as their diameters increased. The Scullin design also addressed stress issues that were present during the casting process. The innovative Frisco applied this design to its new 4300's not long after the patent was filed.
In my opinion, the Scullin disc-centers contributed a lot to the appearance of the rebuilt 4300-series Mountain locomotives. "Form follows function." I've often wondered how one would model these in order to achieve a suitable 4300 kitbash? I had a Spectrum 4-8-2 numbered in the 4300 series, but with spoked wheels. However, I swapped it with another frisco.org member before I could get serious about how to model this feature.
