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Grey dashed sections are closed right now. Train positions are estimates worked out from TfL's arrival predictions, not GPS. Roadworks and closures are TfL's, for main roads only. London buses shows every TfL bus, placed between its predicted stops, so those dots are estimates and can be a street or two out. Other operators are real GPS points from the government's open bus location data. A route you enter is followed using TfL's predictions, so its buses are estimated too.