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Okay, you made me go back in my design history and find out what I did. So according to the Mainline Modeler plans, the height of the blank spot below the tunnel motor-type area (scaled to N scale) should be 1.469mm. I had to fudge that to 1.969mm which fit perfectly. That's 3.12 inches, so my memory was a little off. Still, .5mm is a suspiciously perfect number to be off by. Anyway, 3 inches doesn't sound like much, but I can still see it.
Good question. Bob Hundman's best friend was a designer at EMD so I would hope they're accurate. I would assume that's where he got his resources. I measured that spot with digital calipers and then multiplied that number by .54375 to get 1.469mm.