Great stuff. Now I have some new items to look for.
About the 820 boxcar with brown roof. I am interested in the data stamp. The one Jim just posted has 4 lines with each line shorter than the one above it. Like an inverted pyramid.
I have that car. NONE of my other cars have that data stamp. The common 4 line stamp has the MCB line (3rd down) longer than the ones above and below it. Like the car below:
The car above has a number in an odd font. Sans Serif.
The data stamp was used on the 12 and 16 hopper cars in standard, and on the 820 boxcar in O. Does the inverted pyramid stamp come on the standard cars?
The dark green 600 come with and without the gold stripe, and with and without the lettering over the windows. I haven't seen a car without a stripe and without a NYC over the windows.
Here's a car for you to look for: