I purchased a Susie-Q boxcar some years back thinking it was around in the 1940s. The reason I thought this car was in use then was it was on a friend's layout who strictly modeled post WWII. I was very disappointed to learn this was an early 1960s paint scheme.
There were 25 boxcars painted this way and it looks like some lasted into the '80s. There is GW 8-64 stenciled on the side which I think means the car was painted at the Edgewater, NJ yards on the NYS&W in 1964.
There is an old wood boxcar on display at a museum that has this paint scheme, but that was painted after it was put on display.