Transport minister Andrew Constance said the government is seeking expressions of interest from Australia and around the world to transform the hidden station space.
Named Inter7City – a reference to the fact that they will ultimately link Scotland’s seven cities – the revamped HSTs are part of ScotRail’s grand plans to improve services around the country.
Around 45 per cent of the tram will be covered in large windows. Six passenger information screens will feature inside as will USB charging points - a first in France.
Once completed in 2020, the redeveloped Glasgow Queen Street station will provide extended platforms for longer trains of up to eight carriages and an expanded concourse with more circulation space.
Chris Grayling said the line, which will link Oxford and Cambridgeshire via Bicester, Milton Keynes and Bedford, will "transform journeys in one of Europe's most vibrant economic regions".
Brand new carriages will no longer be coming to the Caledonian Sleeper's Lowland service between London, Glasgow and Edinburgh this month as originally planned.
The standards and protocols that help ensure the different companies across the UK's railway work safely as a system will remain after Brexit, according to the rail industry body RSSB.