Thanks for letting me know about the phrase "Plug Cars" to describe the short boxcars.
I certainly enjoyed scrolling upward and seeing the pictures of these cars posted by others.
Having lived 66 years now, I have mastered my strong impulse to collect things, so I will stick with the most common of these cars in their vivid primary colors.
There is a "bright orange" Plug Car at the flea market, for $8.00, that says General Mills (or maybe it is General Foods), but the color is so translucent I passed it up. Wonder if that is worth anything?
Thanks,
Mannyrock