Four and a half billion pounds will be spent on 600 carriages for the routes from Paddington to Reading, Newbury, Swindon, Oxford and Banbury.
It should lead to major improvements in the Thames Valley.
But a row has broken out about the contract being awarded to a Japenese company.
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Sunday evening's weather update for the east
Sunday evening's weather update for the west
A man has been taken to hospital with serious injuries after being beaten by a gang of 10 in the early hours of this morning.