By Guy Taylor The London Overground’s six lines have been renamed and given their own colours, significantly changing the Tube network’s world-famous map. The move from Transport for London (TfL) comes after research found customer journeys on Overground routes were significantly more confusing due to the lines being labelled with one single colour and name. The Tube map was created by the draughtsman Harry Beck in 1933 and has become recognisable around the globe. The six Overground lines are currently only marked with one colour, orange, and it has been nicknamed the Ginger line. Mayor Sadiq…