Underground steam engine on overnight test run

Metropolitan Locomotive No 1 will pull the Metropolitan Railway Jubilee carriage No 353, which was built in 1892. Credit: Simon Harris for ITV News

London Underground's last surviving steam engine is seen here at Moorgate station on a test run before Sunday's special heritage run.

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London Underground: 150 years

The age of steam returns to the Tube today as part of festivities to celebrate the 150th anniversary of the London Underground. The first passenger journeys took place on January 10th.