I have updated all your steam (using the .ap files). In going through to do some repaints (hope you don't mind) in looking at the new xtenders, which now includes a slopeback yard tender.
The slopeback tender seems to have no reference to the wheels textures in the Slope-back_Tender.GeoPcDx file so it show with missing wheel textures.
Regards, Gerry
BTW...I may have some more inquiries on some of the updated steam if that is okay.