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Check out London Underground's control room
Emma-Louise finds out who keeps the capital's trains on the right tracks.
↗ https://www.bbc.co.uk/newsround/videos/cr7pkm4l1eroEmma-Louise finds out who keeps the capital's trains on the right tracks.
↗ https://www.bbc.co.uk/newsround/videos/cr7pkm4l1ero