UK Transport Secretary Philip Hammond is said to be drawing up plans for a £500m rail scheme linking Wales with Heathrow Airport.
A proposed new spur from the Great Western main line would end the need for passengers to travel in to London before heading out to the airport.
The scheme, to include the west of England, would also connect with the proposed HS2 high speed rail link.
The Department for Transport estimated it could cut 30 minutes off journeys.
The Sunday Times newpaper reported Mr Hammond was considering building a new railway station at Heathrow that would see up to four shuttle services per hour from Reading.
The new airport railway station would take shuttle connections from Reading, including passengers travelling from south Wales. But the newspaper suggests the airport hub could also take trains direct from Cardiff and Bristol.
It would also be a hub for the High Speed Two (HS2) rail link, it added.
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