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Originally Posted by badrunner
There's elevated rail that looks super futuristic with reinforced concrete construction, long clear spans between support columns and nice modern rolling stock. And then there's the decrepit old hulking rustbuckets in older cities, with its million support columns and massive low slung structure creating dark and dingy city streets below.
Be glad that you don't have elevated rail in the city center. Subways are better in every way. Elevated rail is cheaper but that's about the only reason to build them.
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In Miami's case they had to elevate the Metrorail system because the entire metro sits on the Biscayne aquifer which is composed of porous limestone.
You dig a few feet down and you hit water.
It didn't turn out too bad :
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