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I completed a mid size n-scale layout (2' wide x 15'long). It is only two feet wide because there is a closet door I wanted to keep functioning at one end. I saw at Trainfest a show layout with the 9 3/4" radius curves with passenger trains running. While the overhang looked a bit toyish, if hidden in a tunnel or other place, it worked. <br /> <br />I used a 9 3/4 in radius on the inner loop, where I generally don't run passenger trains and 11" radius where I do. The four axle diesels and up to 60 foot freight cars do well on the 11". I have a Kato Dash9 loco that always derails the car behind it on one corner of the 11" rad (but only in one direction), and I don't try using six axle diesels in the 9 3/4 radius corners. <br /> <br />Based on my experience, I would have redesigned the layout to have drop corners for the closet door, or shortened the layout to accomodate a minimum radius of 11" for freight trains and 19" for passenger trains. I have had very poor results bending flex track for loops, so I stick with the sectional track for corners. Otherwise you can bend flex track to get a radius somewhere between 11 and 19". If I were to start over (and I am building an extension), I would keep the radius to at least 16" for everything, especially if you are running modern equipment or passenger trains.
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