We were driving East on the Riverside Freeway and we reduced our speed to a crawl because of freeway construction. At slower speeds, one can look at the scenery without much concern as long as you do not overdo it. I was startled by the sight of a very large and rusty railroad bridge sitting in a field by the side of the freeway. The next offramp and a short drive took me to the rusty bridge. It was immediately obvious the bridge was being assembled in an open field transformed into a construction site. I soon discovered a second bridge in the early stage of assembly nearby. I reached for my trusty Pentax 20D SLR and commenced recording the assembly of the bridges. I have never before witnessed the art of bridge building. The images below are very interesting to me, but what else would you expect from a retired Aerospace engineer and machinist with nothing better to do than photograph railroads.