Thanks Mark!

I have an area on my Christmas layout that has a 20 degree section of about 8' radius that goes into a 9.5 radius turn the other direction. That transition blows the front truck of the tender right off the track. This gives me a real good reason to redesign my Christmas layout.

Jim

I have a N 2-8-4 Berkshire Steam Locomotive with Tender. What is the smallest radius the this locomotive can handle without the tender derailing?