Thanks, Len. That catalog designation is a piece I missed. Appreciate your research. Looks like I have some re-thinking to do about purchases.  Have a happy holiday!

Interesting suggestion, Rich. My experience with You Tube has not involved specific information such as this. It is, indeed, a remarkable resource for having the visual experience, so I appreciate the suggestion. However, while there are many model railroad and streetcar oriented videos, I found none which focused on this problem, for it is not a matter of showing me how to do something or how to modify something in order to get a model to function differently.

Model Railroader or RMC did some articles a few years ago which showed how to modify the new Bowser PCC frames to operate on narrow radius city streets. That may be the type of thing I need to do. But, for now, I am looking for the starting point.  It is a simple specification: What is the minimum radius on which Bachmann PCC, Peter Witt, and Brill HO streetcars will operate?

Thank you, Len. 9" looks like a safe city radius for most brands and styles. I know the old Bowser PCCs were rated at 9".  I am asking because there is city street curve system with pavement inserts that looks promising, but the radius is rated at 6-6 3/4". 9" is not that far off/out of reality. If anyone has better info on the Bachmann PCCs and Peter Witts, it would still be appreciated. Carl

What is the minimum radius for operating Bachmann streetcars: The Peter Witts, the PCCs, the Brills?