While puttering around the Frisco Employee Magazines, searching for info on the Frisco's Mallets, I came across this item on tandem main rods as a way of improving maintenance costs (on page 46 in the following). https://sgcld.thelibrary.org/lochist/frisco/magazines/fem_1932_05/fem_1932_05.pdf It cites how the side rode improvements on 2-10-2 type locomotives. I believe the Frisco's spot series were notorious for pounding the rail to the point of breaking at anything but a ponderous speed; it makes me wonder if these improvements were actually applied to the Frisco's 2-10-2s? I tend to think that this may be an advertisement of sorts in the FEM, even thought there's no indicating that's an advertisement. I would need to double-check my dates, but I also believe that the Frisco's 2-10-2s were already being pulled from regular service in 1932; consequently, it seems a stretch to see them reshopping any of them to make this improvement, only to have them moved back into storage.
Thanks for confirming, Don. Had a hunch; seems that when the Frisco would make actual improvements/modifications, any of the FEM articles would be a little more specific in terms of which numbers, time, etc.