Can anyone tell me the radius (preferrably center) for the Atlas N Code 55 #5, #7 and #10 turnouts? Thanks
Since these are “straight” turnouts, they don’t have a radius per se. The diverging leg doesn’t fit into a curve smoothly, if that’s what you are trying to do (as a Snap-Switch would).
The tightest radius through a straight turnout is called the Rail Closure Radius or Curved Rail Radius and a close approximation is found in the NMRA’s Recommended Practice for N scale turnouts. (It’s only an approximation because the Atlas C55 dimensions don’t match the NMRA RP dimensions exactly.)
This is the radius that would equate to your minimum radius curves on the rest of the layout. That’s line 11 on the page I referenced. Note that the values are in millimeters with the inch measurements in parentheses (Ah, 1979 and the metric push).
Rail Closure Radius
#5 13.75" Radius
#7 25.75" Radius
#10 62" Radius
Again, this the radius of only the tightest point through the curve, not the equivalent of a smooth curve from end-to-end.
By contrast with Atlas, PECO turnouts actually have a curved diverging leg.
This is great and very helpful information. I appreciate your knowledgeable and prompt response.