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A passenger train rides through the Mail Rail tunnels that is included in the Postal Museum in London, Wednesday, July 26, 2017. London's newest tourist attraction is perfect for underground explorers. It's not ideal for the claustrophobic. A visit to Mail Rail, a subterranean train network that once carried millions of letters a day across the city, involves a cramped journey through dark tunnels 70 feet (21 meters) below the surface, on a very small train. It's atmospheric, but not roomy. (AP Photo/Frank Augstein)

A passenger train rides through the Mail Rail tunnels that is included in the Postal Museum in London, Wednesday, July 26, 2017. London's newest tourist attraction is perfect for underground explorers. It's not ideal for the claustrophobic. A visit to Mail Rail, a subterranean train network that once carried millions of letters a day across the city, involves a cramped journey through dark tunnels 70 feet (21 meters) below the surface, on a very small train. It's atmospheric, but not roomy. (AP Photo/Frank Augstein)

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