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I answered another question with the possibility of a world-girdling railroad. Another poster on that thread did not feel that was viable for Earth. I've been pinging around on the Internet ... I find plenty of articles about underwater evacuated tunnels for trams-ocean travel, but I'm curious about surface level trains.
Does the tech exist today to build a surface railway from, say, New York to London, money/time being unlimited? If not, does our science suggest one could be built in the future? In either case, given how expensive such a bridge would likely be, would the bridge, assuming regular maintenance, last long enough to be worth building? Or is ocean just too open and too volatile?