Brian Carlson asked:
Can anyone point me in the direction of some appropriate data for
post-war [Erie] 40' boxcars?

Here's a nice broadside builder's photo from which you can pull the
data:
http://rr-fallenflags.org/el/frt/erie82525adb.jpg

Be aware that the data was arranged differently on the later scheme.
This shot's blurry, but you can see the change in arragement under
the diamond:
http://rr-fallenflags.org/el/frt/erie82751alb.jpg


Ben Hom