Some interesting points here:
http://www.bbc.co.uk/news/uk-wales-sout ... s-40669006*Fast links to Cardiff Central station, with trains able to arrive within six or seven minutes
*The potential for a direct link to Cardiff Airport in about 25 minutes
*Parking for 4,000 cars, costing £5 a day
*Trains will be able to stop from Birmingham and Portsmouth Harbour and be 50 minutes from Bristol, while there could be a train every half hour from Ebbw Vale
*There is hope of fast trains to London also stopping there in the future
*It has already been planned into the South Wales Metro map, with a stop also planned for Newport Road on the way into the city centre