Train services resumed on Thursday, March 28 after ten days of essential round-the-clock work to upgrade track and drainage between Carmarthen and Pembroke Dock.
The railway had been closed to allow Network Rail teams to replace more than 200 metres of track and 300 tonnes of ballast (track stones) between Pembroke station and Pembroke Dock.
Work to improve the drainage between Narbeth and Kilgetty stations was also completed at the same time.
Colin Lea, Transport for Wales, said: “We’re pleased that our colleagues in Network Rail have completed this essential work.
"We’d like to thank passengers for their patience while this work has progressed and look forward to welcoming passengers back in time for the Easter weekend.”