The PTEs and ITAs were established by Barbara Castle's 1968 Transport Act. They were set up as powerful and locally accountable strategic public transport authorities for Britain's largest urban areas.
Find out more about the history and achievements of the PTEs - including the story behind the 1968 Act that created them and some fascinating archive YouTube footage.
Read about the first ten years of the pteg Support Unit.
There is a retrospective on the PTEs key history in this Passenger Transport Magazine supplement.