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The Marklin-Trix version of the Big Boy tech spec's state that it will run on curves down to 14 3/16 (see http://www.ttx-dcc.com/tonystips/2001/121101b.htm ) The Rivarossi version may be built differently and have a larger minimum radius. In any event, the bigger the curve the better it will look and operate. As neilmunck noted above, bigger is better - 26"+. Probably not going to make it on a 4x8 or even 5x9 [:(] You could however, make the layout focus on an engine facility, with a big turntable, coaling tower or oil spout, water, etc and have one "in the yard" for service... Andrew
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