Modeling the "Fargo Area Rapid Transit" in O scale 3 rail.
I don't know how big the Kickapoo frames are, so here are my best guesses.
The Marx 6" tank car is common as dirt, especially in the Santa Fe name. Make sure if you go with this car that both end "caps" are there. They also made this car with two different ends one is noticably more domed than the other.
If that tank is too small, perhaps the Lionel prewar 654 might be better suited. I couldn't find a picture of one in my library, but they are also pretty common.
If neither of those work for you, perhaps you can buy some PVC pipe and some end caps, and make your own. If you go this road, I know I would like to see what you come up with.
J White
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