By Marcus Leach

The London Underground, the world's first ever underground train network, celebrates its 150th birthday today (Wednesday).

On this day 150 years ago one of the world's most iconic transport systems was launched as the world’s first underground train pulled out of Paddington station in London to make the first passenger journey - three and a half miles under the streets of London.

The very first underground line was built by the Metropolitan Railway, a private company which had been formed in 1854 to try and link up the main London stations at Paddington, Euston and King’s Cross with the city centre and business district.

Regarded as the best known underground train network in the world the tube now carries over 3 million passengers a day, and has been the inspiration to numerous other underground systems around the world.

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