OK so I found out that my railroad had a series of what they labeled as Howe (or just Howe) Truss Bridges. I thought I understood what that meant. After looking around I see that there are a few truss bridges designs that look similar in nature.
Most notably the Warren, Pratt, and Howe and double versions of each. In the single forms a warren has alternating diagonals with no vertical members. Pratt and Howes have vertical members but the diagonals are opposite of one another and are not alternating. Pratt’s point down toward the center where as howes point up toward the center. Both the pratt and howe mirror themselves relative to the center. A double Pratt and a Double Howe I assume would look the same. A divided Warren has verts but still alternating diagonals. And a double warren makes crosses like a double pratt sans the verts.
When I Google howe truss bridge the models pictures all seem to be double warren styles with vertical tie rods. That’s what I thought a Howe was.
now my drawings call for a Howe but the drawing resembles a double Warren.
I hopefully will see NP blueprints to follow.
I guess my question is what really is a howe truss bridge. Also I thought all howe truss bridges were a box design with members across the top and bottom like the model above. Is that true, and I also thought a pony truss was basically a howe without top and bottom cross members basically just the sides?
If I can come up with a blue print of a typical NP 1882 Howe like I am hoping then I will follow it, but if not I want to make it right.