Quote from: ACY on July 21, 2011, 10:24:13 AMI do understand. It's just that, if you look in the Bachmann catalog where it says "Works best on 18" Radius Curves" that is merely a recommended minimum radius turn for smooth and realistic operation and my 2-8-4 and GS-4 both are listed in the catalog as "Works best on 22" Radius Curves" but I have had no problem with them derailing on 18" radius turns or smaller and the GS-4 has larger drivers than the J. It's when they get to a switch where the turn enters the diverging track that would go to a siding when my engines are coming off of the siding onto the mainline because that is where I encounter derailments. But I have learned since to use wider switches.Quote from: MilwaukeeRoadfan261 on July 21, 2011, 08:35:51 AMI agree. I have a 2-8-4 and GS-4 and I have gotten the 2-8-4 to run on a flex-track turn that is SHARPER than an 18" radius turn just fine and at the "Track Speed" for my layout.What your locomotive does on any given radius is irrelevant to what radius his locomotive may run on. If you don't understand why this is than I can explain it to you.