Re: RGS 20

At SFHM we have driver centers from an 1883 Baldwin 2-6-0 that are constructed the same way as #20's driver centers. The interior cross braces in rim of the wheel are at the spokes and also 1/2 way in between them. #20's look like they are the same way. The next oldest set of driver centers that we have, the entire rim is a solid piece, and those date from around 1913. I have wondered why the difference between the two for a long time, so Linn if you have a good answer, we can surely pass it on. I have always suspected that it was either metallurgy or casting processes, but I would love to have an expert answer.