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Amended late night / early morning Transport for Wales services to / from Carmarthen from Monday 17 to Friday 21 August 

See all service disruptions

Engineering work details

Starts Monday 17 August 2026 to Friday 21 August 2026

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Train operators affected

Route(s) affected

All routes to / from Carmarthen

Description

Engineering work is taking place between Bridgend and Port Talbot Parkway and also between Llanelli and Carmarthen, closing some lines.

The following services will be amended:

Monday and Tuesday:

  • 20:37 Milford Haven to Cardiff Central service will depart from Carmarthen earlier at 21:36 and run earlier throughout the remainder of the journey

  • 22:26 Cardiff Central to Carmarthen service will depart later at 22:37 and will be diverted between Port Talbot Parkway and Llanelli and call additionally at Neath, Swansea and Gowerton with extended journey times

  • 23:20 Cardiff Central to Swansea will depart Cardiff Central later at 23:27 and will be retimed throughout

Monday to Thursday:

  • 21:07 Pembroke Dock to Cardiff Central will be subject to retimings each night

  • 23:29 Cardiff Central to Carmarthen will terminate at Swansea - a connecting rail replacement bus will run from Swansea to Carmarthen

  • 23:46 Swansea to Carmarthen will not run - you should use the either the 22:27 or 22:37 Cardiff Central to Carmarthen service

Tuesday to Friday:

  • 04:37 Carmarthen to Swansea will not run and will be replaced by an earier bus throughout, departing at 03:55

  • 04:46 Carmarthen to Shrewsbury will start from Llanelli at 05:12 - a connecting rail replacement bus will operate earlier at 04:17

Wednesday and Thursday

  • 22:26 Cardiff Central to Carmarthen service will be diverted between Port Talbot Parkway and Llanelli and call additionally at Neath, Swansea and Gowerton with extended journey times

Check before you travel:

You can plan your journey using the National Rail Enquiries Journey Planner.

Replacement bus travel advice:

For helpful advice if you need to travel on a rail replacement service, including accessibility and bicycle information, please use our Rail Replacement Services page.

You can find the pick-up and drop-off location of rail replacement services by checking station signage or by searching for your station on our Find a Station page.

Please be advised that replacement vehicles may be busier than usual, and you should allow extra time for your journey.

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