All About Postage Stamp Trains
The closest one might be able to come to matching Roco's tank car is American Car and Foundry's 7000-gallon acid car, circa 1940. It's not an exact match, but the next-closest is the ubiquitous 8000-gallon riveted petroleum car, which has a very different dome. It therefore raises some question as to whether or not Shell or Mobil had acid tank cars.
Plastic box inserts (note the spelling on the second one):
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