An Aztec code barcode is used by Heathrow Express and East Coast in tickets delivered to mobile phones and displayed on their screens, on self print tickets, and on tickets ordered online.
The monitors are mostly used for advertising and for news and weather updates produced by Sky News.
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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.