An interesting bridge and a nice centered composition. I don't hold to that everything must use the "rule of thirds" mantra. This image looks great centered. I like the contrasting colors and the sharpness of the image. My one "nitpick", with all of the symetry going on, it's a shame the bottom tie was tilted. If you had cropped the roadbed out of the bottom, it might have masked that a bit more. Overall, a good photo.
More interesting on the 2nd take. Makes me think for a second. If the railroad beams could move closer to the camera, it would be ideal. Of course that is a heavy endeavor.