At the Riordan Mansion State Park in Flagstaff, there are a couple of panoramic photos of Arizona Land & Timber operations in the early 1920s
Box cars include:
(All 40' I believe although I did not look carefully for 36' cars-- definitely no 50' cars)
UP double sheathed
CNW single sheathed
ATSF similar to above but different number series, and had lines above reporting marks and below numbers
ATSF sectional-sheathed (3 single door and one 1 1/2 door marked "Automobile and Furniture"
GN single sheathed (Pratt truss with 3 panels on each side of door) with goat emblem on door
CN 580775 marked "Automobile"