RT @TelegraphTravel: 50 things you didn't know...

May 29 2015 , Written by Ola Fagbohun

RT @TelegraphTravel: 50 things you didn't know about the London Underground http://t.co/cjmOgPUMlR http://t.co/jVBs6KlQLO
Ola Fagbohun (@DiverseTraveler)May 29, 2015

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London Underground: 150 fascinating Tube facts

6. Many tube stations were used as air-raid shelters during the Second World War, but the Central Line was even converted into a fighter aircraft factory that stretched for over two miles, with its own railway system. Its existence remained an official secret until the 1980s. 7.

http://www.telegraph.co.uk/travel/destinations/europe/uk/london/9789966/London-Underground-150-fascinating-Tube-facts.html

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