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Amended late night / early morning1 Transport for Wales service between Swansea and Carmarthen from Monday 25 to Friday 29 May 

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Engineering work details

Starts Monday 25 May 2026 to Friday 29 May 2026

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Train operators affected

Route(s) affected

Between Cardiff central / Swansea and Carmarthen

Description

Engineering work is taking overnight place between Swansea and Carmarthen, closing some lines.

Monday to Thursday:

The 22:26 Cardiff Central to Carmarthen service will divert via Swansea, calling additionally at Neath and departing Swansea at 23:46.

The 23:20 Cardiff Central to Carmarthen service will terminate at Swansea with an onward replacement bus being provided calling at all stations to Carmarthen.

Tuesday to Friday:

The 04:38 Carmarthen to Swansea train service will not run and will be replaced by a bus (dep Carmarthen 03:58, Pembrey & Burry Port 04:28, Llanelli 04:43, Gowerton 05:03, arriving into Swansea at 05:23.

The 04:47 Carmarthen to Shrewsbury service via LLandovery (Heart of Wales line) will start from Llanelli at 05:13, with a rail replacement bus being provided from Carmarthen to Llanelli (departing Carmarthen 04:18, Pembrey & Burry Port 04:48 and arriving at Llanelli at 05:03).

The 05:32 Carmarthen to Cardiff Central service will depart Carmarthen at 05:34 and run approximately 2 minutes later to Gowerton.

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 set-down 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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