Hahaha. No-one would survive ;).
I read about this on bbcnews, sounds cool.
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They would need increase security such as more rail to support the friction and the vibrations more stability maybe 30 inch thick iron line (like above trams but holding it steady not powering it) or more protection such as bigger carriages so you dont get crushed
Windows would be useless on that sort of train lol. Unless you find looking at a blur a good view.