Sure, build an extra-large tunnel to fit monorail inside, just feet from the beach on a low-lying barrier island that will only face more and more challenges with flooding in the future. What could go wrong?
I don't think underground is necessary in Miami Beach but if they're gonna do that they may as well just use regular metro technology rather than a monorail. Putting monorail underground defeats the entire purpose, there are no cost savings and you can't reap the noise/aesthetic benefits of elevated monorail structures.
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la forme d'une ville change plus vite, hélas! que le coeur d'un mortel...
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