Swansea - London rail electrification dates announced
Passengers will benefit from faster train services between Swansea and London by 2018, according to Network Rail.
That is the date given by the company for when work to electrify the line will be completed.
It says modernising the line will cut 20 minutes off the three-hour journey. The £350m investment will also see lines from Cardiff to the south Wales valleys electrified.
BBC Wales business correspondent Nick Servini reports.
08 Jan 2013