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Assuming Gauge 1, that almost all of us run, the typical LGB spacing for back-to-back, 8-foot diameter (1600-series) turnouts is ~7-3/4 inches center-to-center.  This is adequate for most anything on the straights. 
 

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Posted By Jerry Barnes on 02/15/2008 3:32 PM
If you are doing 1/20th narrow gauge, you would probably have to go to 10" at least, if planning a K-27, perhaps a bit more? Jerry


One of our club members triple heads Accucraft K-27s and they fit through his LGB truss bridge that is 6-1/2" wide.  He says that the doesn't buy the K-38 because it won't quite fit through, so I would think that it is less than 7-1/2" wide.   Of course that is on the straights, and curves need more space for the overhang.
 
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