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You will be surprised. Although I am sure somebody will find "proof" of something tighter, Most street railway curves were a minimum of 100-foot radius.

Since you mention using GP9s, I assume you are modeling in 1:29. The 1:29 equivalent would be around 3.44-foot radius so 4-foot radius (or 8-foot diameter) would fit right in and also allow body-mounting of Kadees.

I agree that streetcars would "look" better on tighter curves but those curves would preclude body-mount couplers. That is why the midwest interurbans developed their own boxcars and swiviling coupler mounts (that and the fact that the steam railroads wouldn't interchange cars with them).

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