I am currently working on a passenger station diorama for the 2nd Gauge Layout Party. As part of the diorama I have bridge crossing the tracks and a creek. Actually two bridges. One is for a trolley line, the other is a highway bridge. I am thinking of making the highway bridge a thru girder bridge. Many of the longer span bridges in this area that were built in the early part of the 20th century were thru girders. This is especially true of bridges that were built by the railroads. Another aspect of these bridges is many were constructed with stone masonry abutments and wing walls. I will most likely have to scratchbuild the girders for this bridge out of styrene. One question that I have is how do I make rivets?