Question for the Atlas O operators out there. I need to know what the full diameter of the Atlas O45 curved track is from the outer edge of the ties to the other outer edge. Trying to figure out if a curve will fit on a 48-inch wide section (without having to buy the track to figure it out) 
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Once I get that number, I can figure out the rest of the Atlas O diameters. For example, the Lionel Fastrack O36 is actually 39.5 inches in diameter because of the 3.5-inch wide base, so I know to add 3.5 inches to whatever curved track that I'm looking at.
Thanks!
