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The 10 most overcrowded peak train services recorded in passenger count data collected by train operators between the spring and autumn periods of 2012. This information was first collected and released in 2011.
The Department for Transport (DfT) collects rail passenger counts from train operating companies to monitor train crowding levels. All franchises let by DfT require the train operator to address crowding and to plan their timetables in such a way as to ensure, as far as possible, that crowding is not unduly concentrated on any particular route or individual service.