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New nine-carriage Class 345 trains will run at frequencies in the central section of up to 24 trains per hour in each direction.It is expected to relieve pressure on existing east-west London Underground lines such as the Central and District lines, as well as the Jubilee line extension and the Heathrow branch of the Piccadilly line.A "dive-under" was constructed at Acton to allow passenger trains to pass slower freight trains leaving and entering a goods yard.It was completed in July 2016 and was brought into use in 2017.and joins the main route at Airport Junction, between West Drayton and Hayes and Harlington.Construction of a flyover near Hayes & Harlington station began in 2014, and will allow Heathrow Express trains to pass over the track used by Crossrail, avoiding delays caused by crossings.Part of the eastern section, between Liverpool Street and Shenfield in Essex, was transferred to a precursor service called Tf L Rail in 2015; this section will be connected to the core route through central London to Paddington from May 2019.
Upgrades are being made to stations at Maidenhead, Taplow, Burnham, Slough, Langley, Iver, West Drayton, Hayes & Harlington, Southall, Hanwell, West Ealing, Ealing Broadway and Acton Main Line.
In the east, the line splits at Whitechapel, with one branch running over the existing Great Eastern Main Line via Stratford to Shenfield, and the other branch running through Canary Wharf and emerging from the tunnel at Custom House on a disused part of the North London Line, continuing under the River Thames to Abbey Wood.
In the west the route connects with the Great Western Main Line at Paddington and runs to Hayes and Harlington, where it splits.
The north–south line proposed routing West Coast Main Line, Thameslink, and Great Northern trains through Euston and King's Cross/St Pancras, then under the West End via Tottenham Court Road, Piccadilly Circus and Victoria towards Crystal Palace and Hounslow.
The report also recommended a number of other schemes including a "Thameslink Metro" route enhancement, and the Chelsea–Hackney line.
Due to the size and positioning of the new platforms, Farringdon station will also be connected to Barbican station, and Liverpool Street to Moorgate station.