I'm really curious about the underframe.
It looks like the tank is sitting on another thickness of sheet metal that is shaped to the tank and is where the underframe beams are attached (welded or riveted). The "beams" look like channels, but I'm not sure how the bolster area is built.
I have an HO Mountain with a Vanderbilt tender, I'll pull that out and take a look at what detail they had.
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