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LGB R5 curves are 15 degrees per section so it requires 24 pieces to make a 360 degree circle.
LGB R3 curves are 22.5 degrees per section so you need 16 pieces for a 360 degree circle.
LGB R1 and R2 curves are 30 degrees per section so you need 12 pieces of either one for a 360 degree circle.

By comparison Aristo-craft large radius sectional curves from 11.5 ft dia on up to 20 ft dia. are all 22.5 degrees per section so you need fewer than you would of LGB R5 for a circle. From 10ft dia on down Aristo's are all 30 degrees per section with one exception - their 8 ft diamater curve sections are 22.5 degrees (I suppose to match LGB R3).

Al
 
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