I am a little late to the party, but your Railroad Gun looks great, what a super modeling effort. In a related venue, you might like a little book I came across: "Armored Trains" by Steven J. Zaloga, Osprey Publishing Company, UK 2008 . It starts with the American Civil War, covers WW1 & 2 and several conflicts between. Seems mostly about foreign sources but good coverage especially of Russian / Soviet and German trains. Great pictures of the consists both inside and out. It is softcover and only cost $17 and is likely available on Amazon.
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