11-29-2011, 09:35 AM
If it helps Peco Setrack (replacement train track) comes in !st radius at 14 5/8"(371mm), 2nd radius at 17 1/4" (438mm), and 3rd radius at 19 7/8" (505 mm). Hornby also do a 4th radius at 22.5" (572mm) There are a couple of firms (Roco is one) who did radius 0 at 12" (304mm), and Fleischmann(?) did a (brass)one at 10" - but I wouldn't recommend the three smallest for any normal train running - possibly a 0-4-0 loco and very short wheelbase (toy tinplate or NG critters) coaches for the two smallest only