On 7 May 2008, Johnson said he wanted to ban (stop) people drinking alcohol on the London transport system. This was meant to start on 1 June. Jeroen Weimar, Transport for London's director of transport policing and enforcement, said this was reasonable. He said people should be more considerate on trains. The ban initially applied on the London Underground, Buses, DLR and Croydon Trams. The London Overground was added later in June 2008. Press releases said that the ban was for "stations across the capital". It did not say if this included National Rail stations - especially the stations not served by the TfL lines on which alcohol is banned.