Why we're now seeing more graffiti on the Tube

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Transport for London (TfL) says it is removing about 4,000 pieces of graffiti per day on the Central and Bakerloo Tube lines. It says it is dealing with a huge increase in vandalism on the trains as well as challenges in getting the trains cleaned. TfL says it has a reduced number of trains on the Central line as some are being upgraded, five at a time. The Bakerloo line has the oldest fleet, and hence it has fewer trains. BBC London's Transport and Environment Correspondent Tom Edwards has the story.