NOTE! This bridge is designed to replicate a full scale bridge built in the early 1900's. Clearance through the bridge structure is low (35mm from top of track) but this is higher than scale would be! This is an updated model.
This is my third design specifically for an N-Scale (or 1:160) model. This one is a girder style of bridge of my own design rather than based on a full scale analogue. This one needs a smaller than average nozzle for some of the stays and much of the detail.
There is an instructable covering printing and assembly so I will not cover that topic here.
Note that I model in full scale and that will reflect in the STL files. Also note that the bridge shown in the picture is a version modified to serve as a lifting bridge for a work in progress Bascule ABT Type Draw Bridge.
There are two types of bridges here-in with three sizes for each of the two types. One of the bridge types is a drawbridge for a Bascule style of bridge and the other is a traditional bridge. Three sizes are also provided, four, five, and six sections. You could make a longer bridge by gluing sections together but the largest that I did was governed by platform size.