The two former GWR main lines from London Paddington: the Great Western Main Line (GWML) of 1838-1841 to Bristol Temple Meads railway station (passing through Slough, Reading and Swindon), and the 1903 New North Main Line (NNML) via Greenford to Northolt Junction, which is the start of the Great Western and Great Central Joint Railway line, split at Old Oak junction.
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The GWML has a regular passenger service; the NNML (now partially singled) is used by freight trains and empty coaching stock movements with just one weekday passenger train each way between Gerrards Cross and London Paddington via West Ruislip.
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The proposal envisages diverting the NLL Richmond route to curve around the eastern side of Old Oak Common, and re-routing the WLL to branch west south of the Mitre Bridge before curving north along a short section of the Dudding Hill Line to join the West Coast Main Line.
The Mayor of London, Boris Johnson has been non-committal in supporting the Old Oak Common site, and takes the view that further evaluation is required.
Should Old Oak Common Station be built as proposed it would leave the Great Western Main Line with no traction maintenance facilities east of Reading, Berkshire, although there are proposals for new IEP trains to use the former Eurostar North Pole Depot.
According to the proposals issued in 2010 by the Department for Transport (DfT), Old Oak Common would provide direct interchange between HS2 and Crossrail and Great Western Main Line services, including those operated by Heathrow Express and First Great Western.
When asked about a High Speed Rail / Crossrail interchange at Old Oak Common, Transport Secretary Philip Hammond stated "Lug your heavy bags down a couple of escalators along 600m of corridor and then change trains at a wet suburban station somewhere in north west London. That is not an option.".
The NLL and WLL would meet at a point on the southern side of Old Oak Common, adjacent to Wormwood Scrubs, where new interchange platforms would be built.