http://www.bbc.co.uk/news/uk-wales-south-east-wales-39436502
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130 more seats from Barry to Cardiff Central (all stations except Grangetown) at 08:13 BST
104 extra seats from Treherbert to Cardiff (all stations) at 06:47
208 extra seats from Radyr to Cardiff via Llandaff at 07:50
130 extra seats on the 06:32 Rhymney to Cardiff service
130 extra seats on the 06:09 Rhymney to Cardiff service
An additional 104 seats on the 17:26 Merthyr service
New service - 07:52 Cardiff Central to Barry
New service - 08:13 Barry to Cardiff Central
New service - 07:57 Cardiff Central to Radyr via the City Line
New service - 08:13 Radyr-Cardiff Central via Llandaff
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.
Media captionIs there light at the end of the tunnel for Cardiff commuters?
It said the additions "would not have been possible" without Network Rail's recent £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".
not sure where these extra seats are coming from - possibly 150 work at Crewe might be finished releasing one set?
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Also noted revised services to/from Fishguard, tying in with altered boat times in RTT. Stena website doesn't reflect this though, and w/c 13th June the night boat train is showing as STP, although generally it appears to be withdrawn west of Carmarthen.