As I understand it, the EM-s1 were indeed the smallest locos made with the Yellowstone wheel arrangement , but then its still a fairly impossing loco. I don't have mine yet (should pick it up this weekend, I expect) but I've seen older models alongside scale Big Boys. The EM-1 is slightly smaller -- maybe 1/2 inch shorter or a bit more, just a tad lower and not as fat in the boilers, etc. But I think it still has noticeably more "gravitas" than, say, a Challenger . . .
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