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[quote user="dehusman"]Its also the clearance diagram.  That is how wide is it at different heights on different curvatures.  If its too wide, too low it will hit the lower braces on bridges and scrape passenger platforms.  If its too wide too high it can corner passenger platform covers and truss bridge braces.[/quote] Or if the curve is too tight, the cab roof can come into contact with the tender (N&W 611, 2015 after re-build when attempting to turn on a wye in NC, there is a photo in the Trains Magazine 611 special edition, I think). Better yet, why dont we just ask Ross Rowland.  He can probably give the exact reason.  Edit: Hmm  This thread is about UP Big Boy, but somehow we got onto the '75-'76 AFT.
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