overhead line electrification is now complete as is similar work on the Liverpool - Manchester (Chat Moss) route. On Monday 16 March 2015 the Network Rail test coach and its associated train made a series of passes over the line. This was followed by a series of test runs during the night of 19/20 March 2015 using a Class 319 EMU. The test findings were submitted to ORR who subsequently 'signed off' the route for public service. A single, Saturdays only, early morning out and back run in public service was due to start on 18 April 2015 but the booked electric was replaced by a diesel at the last minute because of electrical problems on the branch. The first public EMU service was the 06:00 Liverpool Lime Street to Wigan North Western and 07:03 return on 25 March 2015; this has run regularly since. Electric trains started all day passenger operation following the new timetable change on 17 May. In December 2009, the then Transport Secretary Lord Adonis, had announced that the line between Huyton and St Helens Line Junctions would also be electrified along with the previously committed Edge Hill to Huyton Junction infill on the Liverpool–Manchester line, as part of a £200 million rail electrification scheme. This work, in conjunction with the previously-announced Liverpool–Manchester line electrification would electrify the entire Liverpool to Wigan route. Additionally, considering currently-operated services; in conjunction with other infill electrification projects announced, this would allow electric trains to operate from Liverpool to St Helens, Wigan, Preston and Blackpool. 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–Manchester electrification, given the interworking of passenger services between the Chat Moss (Liverpool–Manchester) and St Helens (Liverpool–Wigan) lines imposed by the December 2008 timetable. Proposed overground–underground integration It had not been clarified if the newly electrified line would be incorporated within Merseyrail, as was the 1973 plan. The Liverpool–Wigan line was initially scheduled to be on the Merseyrail electric urban network. The Strategic Plan for the North West, the SPNW, in 1973 envisaged that the Outer Loop which was to be an orbital line circling the city of Liverpool, the Edge Hill Spur which is a tunnel connecting the east of Liverpool to the city centre underground sections, and the lines to St. Helens, Wigan and Warrington