Arriva Trains Wales says it has recorded a 'huge rise' in the number of passengers boarding the train at ‘commuter stations’ on the outskirts of cities – with footfall doubling at one site.
It says over the last four years Gowerton station, popular with Swansea commuters, has seen a rise of 94% whilst an increase of 24% passengers now embark at Llanharan, near Cardiff.
Neighbouring Pontyclun station has also recorded a rise in footfall of 15%, and a further 12% boost has been recorded for Pyle near Bridgend.
Caerphilly and Cwmbran have also seen a large increase in the footfall of daily travellers commuting to Cardiff and Newport, with an increase in footfall of 9.1% at Caerphilly station and 6.5% in Cwmbran (in comparison to 2013 figures).
But one of the biggest continuing complaints by passengers is overcrowding.
The company says it is tackling the problem by converting electric trains to run on diesel.
The Welsh Government has paid £1.9m towards leasing the trains, with Arriva paying £1m.
Watch the video report from Mike Griffithsbelow: