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Would You Ride London’s Secret Train 21m Below Ground? 💌📮 Beneath Clerkenwell lies one of London’s most unusual attractions: the Mail Rail at the Postal Museum. This narrow-gauge underground railway opened in 1927 and was built to move post quickly and securely between major sorting offices, completely avoiding traffic above ground. At its peak, trains ran every few minutes, carrying up to 4 million letters a day through tunnels around 21 metres below street level. Today, visitors ca
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