The London Underground is the oldest underground railway system in the world. – Mr. Mimmo

The London Underground is the oldest underground railway system in the world.

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<blockquote class="wp-embedded-content"><a href="https://mrmimmo.com.au/travel_fact/the-london-underground-is-the-oldest-underground-railway-system-in-the-world/">The London Underground is the oldest underground railway system in the world.</a></blockquote>
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