There are limited number of cases where they do - the Tyne and Wear PTE operates the Tyne and Wear Metro, and Strathclyde Passenger Transport operates the Glasgow Subway.
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A number of changes to PTE/As were made under the Local Transport Act 2008.
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Merseytravel (One of the two PTEs on the route) had previously stated their aspirations for the St Helens infill electrification; considering it a necessary addition to the (then-proposed) Liverpool to Manchester electrification, given the interworking of passenger services between the Chat Moss (Liverpool to Manchester) and St Helens (Liverpool to Wigan) lines imposed by the December 2008 timetable.