Rick:
Looking for a larger radius turnout? Try Fox Valley. They make a turnout with code 137 rail (like the MTH or old SHS rail, AM rail is code 147) in both highrail and scale versions. It is a No. 5 turnout which approximates a 39" radius curve. I have used these on my scale/highrail layout since they were introduced about 2 months ago. Modified the highrail to accept both high rail and scale wheel flanges. Quality product.
Roger