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They are scratch-build ones. I made them from 0,5mm polystirol sheets. The guns are from sprues frames. I hade some H0 chassises, so they're based the size of the wagons what I could build.
Fantastic work, Krisztian! The Russian Civil War has so many possibilities for games and dioramas. David Bullock's Osprey books on Armoured Units of the RCW has lots of useful info on military trains on all sides - Vanguard 83 and 95