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I think the greatest limitations are turning facilities and curves. And the large overhang in curves can get problematic if tracks are too close together. The Big Boy has axle loads of 67,500 lbs, nothing unusual on mainlines today, and it was designed to negotiate 20 degree curves. The axle loads alone are not critical for mainline bridges. The shock loads from the reciprocation action can be. But reducing speed can minimize/eliminate this problem So there are much more routes the Big Boy can run on today than were when built. Problematic might be branch lines and shortlines with light rail and light bidges I don't see diamonds only as a temporary limitation. They get repaired on a regular basis. Regards, Volker
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