I had a 4-8-4 that I ran around 18" turns--but it didn't like it. Think 22". I run small steam--the size that would fit in the 4-8-4's tender. I stick to a minimum of 18".Alright because that's one thing that I'm worried about with latest layout shape is that I have some turn radius of about 13.5", and I'm afraid my 4-8-4 won't make it around it. I'll give it a whirl tonight after work.
This 24" curve radius is one you made or some 24" radius curved track. If you make your own as I do any slight imperfection in any radius will cause you trouble. I use the cruve radius metal templates and even then some times I have trouble and have to relay the track.I have a HO 4-8-4 that doesn't even like 24" radius, almost 2x bigger than the curve mentioned above. If NickB is in N scale he should be ok. It is always best to go with the biggest curve possible even if it means leaving out some track. Most model railroaders try to do too much in a given space. I am building some modules and keep reminding myself that in HO a 2ft x 4ft module is only slightly larger than an American football field.
Here is a link to a photo of my next up for construction module. It is BN jct in Hillsboro, OR. The yellow lines are outlines of the 3 modules it will take to build it in a way it will fit in my Civic. The ends are 24" wide and the curve is 42" radius. In HO, the real life the curve is about a 48" radius and it looks pretty sharp standing on the ground next to it.
Thanks for letting me go off about one thing that bugs me, overly sharp curves,
It is actually a brass NP A-5, a largish Northern. It won't go around Atlas 24"rad. sectional track set up on a flat surface. The pilot truck hits the cylinder cocks (?) on the bottom of the cylinders. It is ok so far though because the only curve I have is a #9 turnout and it looks great there! When I get DCC and lights in it (and more track/modules) I will figure something out.This 24" curve radius is one you made or some 24" radius curved track. If you make your own as I do any slight imperfection in any radius will cause you trouble. I use the cruve radius metal templates and even then some times I have trouble and have to relay the track.
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