They do. The point they derail is where the curvature reverses. I guess their 24" radius would be a perfectly laid new track example. Upshot is: I will be lifting that section of track and relaying with 28" radius. Pain in the arse, but needs must...
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Just to put my 2 pence-worth in: I have just finished track laying on my test-track layout which has a minimum radius of 24". Guess what: my expensive Walthers Budd passenger fleet don't like it, derailing virtually every time. They are fine on the 28" curve though....
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"Lightly weathered"!!! Looks great. One problem: you are now obliged to bring your entire layout up to this standard...
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