Smallest prototypical curve in HO?

[RobertInOntario]

The Credit Valley had curves in its narrow gauge days that were on the order of 700' radii, and these were described in print as "tight". That works out to about 10' / 120" radius in HO...!

But transit curves are probably the tightest prototypical. Out at the Halton County Radial Railway museum, they have a turning loop that can't be more than 60 or 70 foot radius - that's under 10" in HO.

Andrew

Thanks, Andrew. I was just thinking of those HCRR loops as they certainly are tight! Their streetcars will go through them but not their larger interurban. Cheers, Rob