I had ask this question to MTH a year ago. Sorry they never got back to you as they did personally call me with a measurement. At that time I was told a big boy had an overhang of 3 and a half inches. Now my original question was how much does an engine overhang so I can place another track next to the existing track. Interestingly enough i FAILED to ask what the size curve as mentioned here is this discussion. Yes the curve is definitely going to make a difference. I would think the answer reflected the minimum curve that was listed for the Big Boy. Hope this helps. Regina at MTH may remember as she was the one whom I talked with. Please remember that it took over a week for her to call back as they had to actually make the measurement. Again that was in 2015 at the end of the year.
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