David D. Thanks for using up precious bandwidth to visit my web site. I'm not sure, however, which photos you're referring to. If it was those on this page about Early vs. late AF diesels open-frame motors then I apologize for any confusion they created for you because I don't mention or have any examples of link coupler vs knuckle coupler side frames. The first photo of 360 vs 470 side frames includes a note that the KC shown on the left for the 360 is not original (i.e. not a rear 360 side frame). The photo after that one is of a rear 360 side frame. It is annotated accordingly in terms of the tow bar, etc. I'm not sure where you picked up on link couplers. Perhaps you are referring to a different page or set of photos? If so, please let me know. I'm always open to corrections, learning, and better information from those who have it. Thanks. In terms of the early vs. late wheels photo on that page, I'm not sure what you mean by mid-wheels, from the same axle sets, but I'm open to understanding that as well. In the meantime, the solid metal (brass) wheels on the left are from an early black-truck 360 and the two pullmor wheels shown are from a 372 -- good examples as far as I know of early (pre-pullmor) vs late (pullmor) AF diesel wheels. Of course metal wheels are also present on later production diesels -- not every wheel was or can be pullmor -- metal wheels are needed to pick-up power from the tracks. Thanks.
To avoid potentially similar confusion by other readers or web site visitors in the future I will replace the photo of the 360 vs 470 with one that doesn't show a KC at all on the left (360) side. Thanks for the notion to do so.
Dave
