Thanks for the info, George.
Alas, my little Therm Ice "reefer" I've had since the early seventies has
three of its four corner steps missing.
There is paint over the spots where the steps would have been attached,
though, so it was molded that way.
I have seen quite a few RoCo cars with non-fill where the corner steps are
concerned. Just not many with THREE missing! I must not have looked at it
too closely when I bought it.
It has always been one of my favorite A1G cars.
Doug