Sometimes I love telling banalities. Lay your radii as big as you can afford them. Many years ago I bought a german streamline steamer, a BR 06. Can be seen here: https://de.m.wikipedia.org/wiki/DR-Baureihe_06. In HO it is a huge monster of an engine. Made by Brawa, it had aprons for the trailing trucks with cut out segments for the trailing trucks to handle small radii. The parts for a more prototypical appearance were added as spare parts. I installed those out of optical reasons - but the loco needed a one-meter-radius from then on. The conclusion? Being a M?rklin AC model the loco and my layout got provided the biggest C track radius M?rklin produced. What also was a benefit for trains with long cars.
In short: The closer your radii are to the real thing the less trouble they shall get you. Some day you come across a Big Boy. Or a Challenger. Or something similar in that lengh. Then you'll curse your decision of using small radii years ago. Again: Check the dimensions you have left for your layout. Think big. And enjoy our beautiful hobby now and in the years to come. No lists needed.
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Greetings from Middle Franconia, Hans
