The Cambrian Coast Line

The Cambrian Coast Line runs about 58 miles along Cardigan Bay, from the market town of Machynlleth to Pwllheli on the Llŷn Peninsula. Halfway along it crosses the mouth of the Mawddach on Barmouth Bridge, a timber viaduct 900 yards long that opened in 1867. It is the longest timber viaduct in Wales, and the trains still cross it slowly, with the estuary on one side and the open sea on the other.

The line was built in the 1860s by promoters who hoped to open the coast to visitors, and its bridge has twice needed rescuing. In 1980 shipworm was found eating the timber piles and the viaduct was closed to trains until 1986; between 2020 and 2023 it was rebuilt again, and it reopened in December 2023. Either side of the bridge, a single-track railway threads round the Dyfi estuary, along the cliffs at Friog, beneath Harlech Castle and across the Dwyryd to Porthmadog and Criccieth.

Transport for Wales runs a train about every two hours, and the journey takes around two hours and twenty minutes. It is an ordinary local train, not an excursion: many of its stops are small halts where the train calls only on request, which makes it easy to get off for a beach, a castle or a walk and catch a later train.

Many trains for the coast start in Shrewsbury or Birmingham International and cross mid Wales on the Cambrian main line. At Machynlleth, where the whole line is signalled from, trains for Pwllheli and Aberystwyth divide or join, and the coast train sets off down the Dyfi valley.

Machynlleth to Barmouth

A few minutes on, the line forks at Dovey Junction, an island platform in the marshes of the Dyfi National Nature Reserve that no road reaches, only a footpath. The Aberystwyth line heads south; the coast line follows the north shore of the estuary, through a string of tunnels behind Aberdyfi. Its builders had meant to bridge the Dyfi from Ynyslas, and gave up in 1864, defeated by the soft estuary bed and the cost.

Beyond Tywyn, where the narrow-gauge Talyllyn Railway starts, the line climbs to a ledge high above the sea at Friog. Locomotives fell from this ledge after rockfalls in 1883 and 1933, and in 1940 the Great Western built a concrete avalanche shelter over the track. After Fairbourne, the train calls at Morfa Mawddach, once Barmouth Junction, where the closed line to Dolgellau is now the Mawddach Trail, and turns onto Barmouth Bridge. It crosses the 113 timber trestles at no more than 22 mph and finishes on the steel spans at the Barmouth end, built to swing open for tall ships.

Barmouth to Pwllheli

North of Barmouth the railway keeps to the shore, behind a sea wall that storms breached in January 2014. At Harlech it runs along the flat ground below the castle rock: the sea once reached the foot of the rock Edward I built on in the 1280s, and it is now half a mile away. The line crosses the Dwyryd estuary on Pont Briwet, a road and rail bridge that replaced the old timber viaduct in 2014–2015, then passes under the Ffestiniog Railway at Minffordd.

At Porthmadog the main line crosses the narrow-gauge Welsh Highland on the level, the only flat crossing of two gauges in the United Kingdom, and both narrow-gauge lines start from the harbour — see the Ffestiniog & Welsh Highland Railways. The last stretch runs past Criccieth and its castle on the headland, and along the shore of the Llŷn to Pwllheli, where the station has stood beside the harbour since 1909.

The trains

The coast is worked by Class 158 Express Sprinters, two-car diesel units built by British Rail at Derby between 1989 and 1992 and now painted in Transport for Wales red. Their successors, the Class 197s built by CAF, have been on test along the coast in 2026, and Transport for Wales says they will start running on the Cambrian lines from the autumn. The line has no lineside signals: since 2011 it has been controlled by the European Rail Traffic Management System, with the driver's instructions shown on a screen in the cab — it was the testing ground for the system in Britain.

Transport for Wales runs eight trains each way between Machynlleth and Pwllheli on weekdays and Saturdays, and five on Sundays, about every two hours. The whole journey takes about two hours and twenty minutes.

Northbound, Monday to Friday

Southbound, Monday to Friday

Good to know:

• Saturdays have the same departures from both ends, with some northbound arrivals a minute or two different.
• Sundays have five trains each way: north from Machynlleth at 10:04, 12:52, 14:53, 16:52 and 18:55, and south from Pwllheli at 09:34, 11:28, 13:40, 15:33 and 17:36.
• Through trains. The 09:27, 11:27, 13:27, 15:27 and 17:29 from Shrewsbury run through to Pwllheli on weekdays without a change.
• Request stops. Many of the small halts between the towns are request stops, where the train calls only when someone is waiting or has asked to get off.

Times as of October 2026, from the National Rail journey planner for Tuesday 13, Saturday 17 and Sunday 18 October. Check your date on tfw.wales (opens in a new tab).

The Cambrian Coast Line is part of the National Rail network, so tickets are ordinary National Rail fares, sold by Transport for Wales at stations, on the train and online, in Standard class only. Sampling the National Rail journey planner for one adult from Machynlleth to Pwllheli on Tuesday 13 October 2026, the lowest single offered on most trains was £9.20, and the lowest return £18.40.

To get off and on along the way, Transport for Wales sells the Explore Cambrian Coast day ticket: unlimited travel for a day between Pwllheli, Aberystwyth and Machynlleth for £21, or £10.50 for a child, valid on the region's buses as well. Fares checked October 2026 on the National Rail journey planner (opens in a new tab) and tfw.wales (opens in a new tab); pounds sterling.

Interrail passes are valid. Interrail's own table of railway companies for Great Britain lists Transport for Wales as included, so the line is covered by a one-country Interrail Great Britain Pass or a Global Pass.

Visitors who do not live in the UK can also buy a BritRail Great Britain Pass, which is valid on National Rail services across England, Scotland and Wales. Neither pass covers the narrow-gauge railways that meet the line at Tywyn, Fairbourne, Minffordd and Porthmadog: BritRail's conditions exclude privately owned, steam and heritage railways, and Interrail's table does not list them.

For this journey alone, a pass is not worth buying. A single from Machynlleth to Pwllheli sampled at £9.20, and the Explore Cambrian Coast day ticket costs £21. A pass pays only when the coast is one day of a longer trip around Britain.

Checked October 2026 against interrail.com (opens in a new tab) and britrail.com (opens in a new tab).

With a train about every two hours, the coast is easy to take in stages: get off at one town, look round for a few hours, and catch the next train on. The places below run from south to north, from Machynlleth to Pwllheli.

Two hotels make good bases. The Wynnstay is an old coaching inn on the main street of Machynlleth, where the coast trains start. Further along the line, the Royal Sportsman stands on Porthmadog's High Street, a short walk from the harbour where the Ffestiniog and Welsh Highland trains leave.

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