If using steel posts, its going to be a fair amount of alignment work (shimming) to get it all built up perpendicular and parallel and able to withstand the side-forces as you trolley the load. I think I'd cut a piece of 2x4 used with a carpenter's square to act as a perpendicular spacer and use that with a helper to set the gap before you finalize the location of the runways. The other piece of advice since I read about "planning" is that your runway tracks need to be as parallel as humanly possible to avoid a bind. Not impossible to deal with but you need trolleys to support that upward load - and most purchased units won't have that.they are just designed for straight-down. That type of force is non-traditional in a bridge crane system. If I'm thinking about that correctly, there's could be a significant uplift on the opposite runway truck as you go farther out on the cantilever. When you say that the runway rails are 13' apart and the bridge rail is 37' does that mean the bridge rail is cantilevered 12' on each side of the runways (?) In other words you have 12' cantilever + 13' double-support + 12 cantilever to make the 37' total (?)
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