This was a 10 panel 1937 "AAR" design box car with 5/5 ends (resinCP #223472
part from Dan Kirlin/Sylvan) and "flat panel" roof (also Kirlin/Sylvan).
From series 221000-223949. Not sure of builder or date. AJAX brakes.
Jim Sands posted an excellent photo of one of these on his web site.
This was a 10 panel AAR style box car built by Canadian Car & FoundryCN #522526
in 1948 (series 522500-523999) with 4/4 IDE-2 ends (rolling pin with
short top rib), 8-rung ladders and rectangular panel roof. This is a
match for the Intermountain "Canadian" box cars.