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I need some help with designing my new layout. I have built several in HO scale but I want to build an N scale layout. I want to do a large freight winding through the mountains. What I need to know is how to figure out the sharpest radius I can with a 4-8-4 loco. And if any one could direct me to some info on figuring grades that would be very helpful as well. I have done two level HO layouts before but I never actually planned out the grades. I always just went with whatever. This one will be a lot more complicated of a layout so I would like to be sure everything is going to work well before I build it. <br /> Dave <br />
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