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I'm modeling in HO, and the parameters have changed some, as well as my plans. Let me explain.... The bridge is now about 22" long after better measuring the required span length. After the scenery is added it MAY end up being longer or connected to a trestle on one end. The minimum internal bridge width is almost 4 1/2" to allow for the curve in the track. Extending the bridge into the potential trestle area will not significantly add to the bridge width. I can still build a wooden bridge and keep it prototypical, as the largest wooden train bridge was about 150', and was a Howe. For now I substituted a piece of 1/2" OSB for the bridge to keep the track laying going. I'll continue with the construction work, and this will allow me to better formulate the bridge design to match what I finally build for the layout. I still want to fully think this through, as this bridge will be right at eye level when you first enter the room, and I want to be SURE and get it right. Mark in Utah
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