Train Overpass

The nighttime traffic churns through the city, desensitizing the residents to unnatural metallic sounds that would otherwise annoy and aggravate the senses. This system of flowing people, removed from the outside world in capsules that whip through the chilly air, is what has enabled such huge societies to exist, and will continue to for the foreseeable future. You relax inside your pedestrian's pod, and wait to arrive at your doorstep. An overpass (called a flyover in the United Kingdom and most Commonwealth countries) is a bridge, road, railway or similar structure that crosses over another road or railway. The world's first railroad flyover was constructed in 1843 by the London and Croydon Railway at Norwood Junction railway station to carry its atmospheric railway vehicles over the Brighton Main Line. There are six main types of bridges: beam bridges, cantilever bridges, arch bridges, suspension bridges, cable-stayed bridges and truss bridges. Bridges may be classified by how the forces of tension, compression, bending, torsion and shear are distributed through their structure. Most bridges will employ all of the principal forces to some degree, but only a few will predominate. The separation of forces may be quite clear. In a suspension or cable-stayed span, the elements in tension are distinct in shape and placement. In other cases the forces may be distributed among a large number of members, as in a truss, or not clearly discernible to a casual observer as in a box beam.