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I'm assuming you're using sectional tack. For reliable operation, I wouldn't think of using anything less than 18" radius for the rolling stock you mentioned. I used 15" radius for a industry spur on my previous layout and anything longer than 40' or a switch engine (SW1500) would derail every time. If it's too tight, don't bother putting it in. Take a look at the replies to a question I asked, [url="http://www.trains.com/community/forum/topic.asp?TOPIC_ID=12872"]How Many Layout Have You Built and What Did You Learn From Them"[/url]. Most say one mistake was using too tight of a radius. <br /> Save the 15" curves for trollys and street cars.
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