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Hello I am using code 100 flex track. I need to know what is the tightest radius I can make, and have my SD-70 and bigger steam engins run on it??
Thanks
John
 

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I recall an article in Model Railroader Magazine some years back. As I recall the larger truck engines, the SD's, the Dash-8's and 9's, the AC8800's and longer steamers needed a minimum 24" radius, some actually requiring a 30" radius. You may get by with a 22" radius but would have to maintain lower speeds.
 
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