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Murdoch17 posted a topic in LEGO Train TechThis truss bridge's design was started a decade ago when I received CITY set 7900 (Heavy Loader) for Christmas 2006. I loved the truss part's Technic-y design, but it didn't work with my original black and red trains, so I shelved the parts, hoping that someday reality would catch up with my dreams. After about 4 years, I designed a workable bridge using most of the parts of Bionicle set 8995 (Thornatus V9) which was purchased for the parts alone in 2010. It looked bad and wasn't tall enough for most of my trains, so I tore it apart in 2012. (you can see it in the LDD screenshot above) I kept sitting on the idea for another year and a half until 2014, when I designed this current bridge. This bridge was just finished in Real Life yesterday due to constantly tweaking the design and perpetually fearing it wouldn't work right. The model is five tracks long, but the bridge itself is four tracks. The reason for the extra track is to give the engines preparing to cross the bridge room to straighten out from curves / switches. I still have another two pieces of flex track (not shown) before the bridge as well for evening five tracks out to six.... it makes layout planning so much easier when (mostly) everything is in even numbers of track. The model is not able to be doubled up to make a two track wide bridge without significant modifications. The model can fit 8 studs wide trains with ease, and is tall enough to let all my trains (and most, if not all, of the official sets) through. The bridge is even strong enough to be carried by the top grid-work, as long as you don't swing it around / slam it down hard. LDD file for the newer gray-scale bridge: http://www.moc-pages...1451924070m.lxf Comments, Questions, & complaints are always welcome!