Would anyone know the latest date that XM-1 boxcars ran with their original Reverse Credo doors and K Brakes, past 1950?

When the cars were equipted with K Brakes originaly, when built. Did they have powered Ajax powered Hand Brakes installed or were they Shaft type Vertical Hand Brakes? What is the closest Floquil RR Paint color for these cars?

Thanks !

According to the info I have; the Creco doors where used mostly in the 20's and 30's and where replaced by the youngstown style after that. As to the K brakes; cars using these where not allowed on "new" equipment after 32 and was banned from interchange after 53.