text: It will add an extra 600 seats a day for commuters into the Welsh capital after being criticised for having too many overcrowded trains.
  Arriva Trains Wales, whose Wales and Borders franchise expires in 2018, is adding morning weekday services into Cardiff Central from Barry and Radyr.
  Economy minister Ken Skates had said Arriva's profits were "too high."
  The Wales and Borders franchise - which is one of the UK's most heavily subsidised, receiving between Â£110m-Â£160m a year - has seen passenger numbers rise from 18 million in 2003 to 30 million.
  About 265,000 people use Cardiff Central station weekly and a BBC investigation found overcrowding in Cardiff stations during the morning commute was rising at a faster rate than anywhere else outside London, according to figures from the Department for Transport.
  Arriva Trains Wales now plans to add extra capacity and extra trains from 22 May on the following routes
  Arriva Trains Wales said the additional trains were "subject to railway approval processes" but the announcement is "one of the most significant improvements to valleys commuters in a decade".
  It said to implement the changes, the operator "needed to remove one midday Penarth service and one midday Barry service".
  The firm has a zero growth contract - which means it has the same number of trains it had when it began operations in 2003.
  It said the additions "would not have been possible" without Network Rail's recent Â£300m signalling upgrade works and new platform eight at Cardiff Central.
  "This is one of the most significant improvements to valleys commuters in a decade, since the opening of the Ebbw Vale line," said Arriva Trains Wales customer services director, Lynne Milligan.
  "With only a limited number of trains in our fleet and the lack of availability in the UK we have had to work hard to get the most from what we've got."
  Network Rail Wales said "more trains are travelling through Cardiff than ever before".
target: Capacity on the "busiest trains" into Cardiff will double from May, Arriva Trains Wales has said.