The old Loughor Viaduct has been replaced and work is focusing on laying two tracks through Gowerton for the start of services on Monday.
More top news
Carwyn Jones speaks to our Political Editor Adrian Masters in the final part of our pre-election series on ITV Cymru Wales.
Alexandra Lodge has been to Aberconwy, where Plaid Cymru, the Conservatives and Labour are all hoping to claim victory.
Cloudy skies to start the day, and rather windy with prolonged rainfall during the morning which will be heavy at times.