London underground or the 'Tube', as the Londoners call it, is a rapid transit system in the big city and is used by thousands of people everyday, locals as well as tourists. It's the fastest & most convenient way to get from one place to another in no time bypassing the busy & crowded streets of London. The underground usually gets very busy at the rush hour; therefore, it's better to ride it at the 'off peak' hours which can be a bit cheaper as well.
It is the oldest underground railway in...
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