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Many years back a good buddy of mine Monte Kelch from the Cincinnati area also thought this would be a good idea! (Admittedly he had to start with a Russian-ized German flatcar!)
Pretty cool. It's been an idea of mine for a while now. The Russians had a number of two axle armored rail cars built during the war. Early on they had mainly 4 axle cars with one or two turrets, but later switched production to two axle rail cars. I think the lesson was that multiple cars were smaller targets, and a single hit no longer had the potential to put two guns out of action.
I believe the most common was the OB-3 type
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There was also a version with T-34 turrets
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Here's an interesting one of a T-28 turret setup mounted on an armored platform
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This armored quad maxim mount was also used on two axle railcars
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Can't tell what type of car it's on in that picture, but scale drawings of the setup are available in a Polish language book on armored trains.
The question is, I have no idea if this MiniArt kit is the right flatbed since I have no idea on the standard rolling stock the Russians had. I've got a couple books coming in on Russian Armored trains, so I'm hoping there are some scale drawings I can compare with the kit and see if I got a match.