Moderate poly count steel (and cement) railway bridge with truss and arch components
The model has 67 unique components and 1 light. All pieces are named. The 'CenterSpan portian is the middle deck, the below deck tubular assembly and the cable pieces that join the arch.
The Bridge_Arch piece includes the arch and the large primary pillars.
The sleeper segments consist of 10 sleeper objects attached (made via array tool separately then later merged into the scene and positioned). All of the bridge pieces are unlinked so moving one or more can be done as needed.
Lighting is provided by a simple skylight.
Material-wise there is a mental ray wireframe material but it has not been applied to the end model. I have saved the material with the model though.