Return of the Happy Minimum Test

From left to right: 6", 5" (the HO equivalent of the tightest TTC curve), and 7" radius curves. I'm having some trouble settling on a design for my Taronna layout. There are numerous problems. One significant one is figuring out what the minimum radius curve I can use that will not cause a problem for streetcars, and be reminiscent of the older, tighter curves in the TTC streetcar system. I…