Here is my latest redesign of the St. Louis bridge, commonly known as the Eads bridge because of it's designer, James B. Eads. It uses Indiana Jones roller-coaster ramps for the arches, which looks pretty cool.
The bridge was just redesigned to have seven more bricks of space from top to bottom, with the flared sections at the bottom breaking up the monotonous sides of the model. this allows for taller boats to pass through underneath and is more prototypical.
The bridge is nine tracks total in length and 17 bricks high from base to track. (this means about fourteen brick of clearance between arch top and floor, so some ships could pass through!)
Here is the modular component, of which three of these big sections together via eight Technic pins (four per section) to make the whole bridge.
Yes, I know the top deck should be for cars and the trains should run through the arches, but I could not figure out how to do that, and it would be extremely expensive as well. So my design isn't 100% accurate, but it works!
The new parts are all in the base of the bridge, as seen here.
The real Eads bridge. (not my pic!)
"The Eads Bridge is a combined road and railway bridge over the Mississippi River at St. Louis, connecting St. Louis and East St. Louis, Illinois.
The bridge is named for its designer and builder, James B. Eads. When completed in 1874, the Eads Bridge was the longest arch bridge in the world, with an overall length of 6,442 feet (1,964 m). The ribbed steel arch spans were considered daring, as was the use of steel as a primary structural material: it was the first such use of true steel in a major bridge project.
The Eads Bridge, which became an iconic image of the city of St. Louis, from the time of its erection until 1965 when the Gateway Arch was constructed, is still in use. The bridge crosses the St. Louis riverfront between Laclede's Landing, to the north, and the grounds of the Gateway Arch, to the south. Today the road deck has been restored, allowing vehicular and pedestrian traffic to cross the river. The St. Louis MetroLink light rail line has used the rail deck since 1993."