Norfolk & Western 100000-101749
Shown in the 1919 Car Builders' Cyclopedia, built by N&W in 1914, N&W class GKa; 750 built. Class GKb 15" shorter but 3" taller, built 1916, series 100750-101749. Rebuilt extensively 1927-1930, redesignated class GKd.Trucks used on N&W battleship gons
I have several other detail photos of these trucks...
Sorry I can't be more helpful on this subject!