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In page Transport for London:

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TfL also owns and operates the London Transport Museum in Covent Garden, a museum that conserves, explores and explains London's transport system heritage over the last 200 years. It both explores the past, with a retrospective look at past days since 1800, and the present-day transport developments and upgrades. The museum also has an extensive depot, situated at Acton, that contains material impossible to display at the central London museum, including many additional road vehicles, trains, collections of signs and advertising materials. The depot has several open weekends each year. There are also occasional heritage train runs on the Metropolitan line.[citation needed]