🚂 World's oldest narrow gauge railway and Snowdon: a Wales trip plan

A real steam locomotive in the mountains of Wales looks like a movie set. In Snowdonia it is working transport: coal trains have run here since 1863 (according to Visit Wales).

Snowdonia National Park, or Eryri, covers the north of Wales. Inside it you can easily put together a full day: a steam railway, the highest mountain in Wales, and a glacial valley with a lake.

Below you will find which trains run in 2026, how much tickets cost, and which trail to choose based on your fitness level.

Ad: this article contains affiliate links, we earn a commission if you book through them, at no extra cost to you.

Snowdonia: what to know before you go

💡 In short:

Eryri National Park covers about 2,130 km² and welcomes about 4 million visitors a year (official park website).
The Ffestiniog steam railway runs 21.7 km from Porthmadog to Blaenau Ffestiniog (route description on Visit Wales).
The trail to Llyn Idwal is suitable for intermediate level (National Trust about the trail).
Prices and opening hours: 09/2026, checked on the official website.

Most visitors come here for one day. That is enough to ride the steam train and walk one mountain trail. If you are planning a hike, allow extra time for changeable weather.

Panorama of Snowdonia mountains from a rocky summit on a clear day

Ffestiniog Railway: the world's oldest narrow-gauge railway

The Ffestiniog Railway is considered the oldest narrow-gauge railway in the world. It opened in 1836 to haul slate, and in 1865 it became the first in the world to carry passengers on a narrow gauge (Ffestiniog Railway history).

Steam locomotive Earl of Merioneth at Porthmadog station

The locomotives here are real and coal-fired, and the carriages are more comfortable than museum pieces. Some of the staff are volunteers, and some local families have been connected to the railway for several generations. The railway and its infrastructure are part of the UNESCO World Heritage Site "The Slate Landscape of Northwest Wales".

The route passes through pastures, oak groves, and tunnels. You will see waterfalls, lakes, and mountain slopes right from the carriage window. At Tan-y-Bwlch station the train makes a stop, and you have time to walk a nature trail.

Routes and tickets for the steam train

The operator offers several named services. The "Mountain Spirit" train runs the full route from Porthmadog to Blaenau Ffestiniog, while the "Woodland Wanderer" takes a short trip to Tan-y-Bwlch with a walk along the trail. The full route takes several hours, so allow half a day.

Tan-y-Bwlch station with a train at the platform

See the operator's website for the full list of services and the timetable. Trains do not run every day, and tickets are worth booking in advance. Child tickets are cheaper than adult ones, but the rules change by season, so check the price when booking.

Snowdon and the national park trails

The second part of the trip takes place in the mountains. Snowdon (Yr Wyddfa) is considered the highest peak in Wales, and the park around it is called Eryri. There are dozens of trails here for different levels, from easy walks to full climbs.

Glaslyn lake and Snowdon mountain trails

If you have an intermediate fitness level, take the route around Cwm Idwal. It is short but gives you a real feel of the mountains: cliffs, the lake below them, and a hanging valley. Nowhere else in Britain does the rare arctic flower, the Snowdon lily, grow except in Snowdonia.

Stick to open trails and check the weather in the morning. Rain and wind arrive quickly in the Welsh mountains, so take a waterproof layer even on a clear day.

Cwm Idwal: a hike to a glacial lake

The loop around Llyn Idwal takes 1.5 to 2 hours and is about 4.8 km long (National Trust). It is Wales's oldest national nature reserve, and the ascent here is moderate.

Panorama of Cwm Idwal with a glacial lake and mountain trails

The trail starts from the car park at Llyn Ogwen and climbs to a glacial cirque. Below, a turquoise lake and the Glyderau rock wall open up. After rain the stones are slippery, so you need shoes with good tread.

In the 19th century, Charles Darwin visited this area. His observations at Cwm Idwal later fed into his book "On the Origin of Species" (park visitor center).

Go in the morning: by midday the car park has few spaces left, and groups appear on the trail. Walk the loop, so you see the valley from two angles.

Tickets and opening times for the Snowdon Mountain Railway

If you do not want to walk up, a train from Llanberis takes you to the summit of Snowdon. Services run from March to early November. Return tickets to the summit (as of 09/2026, official website):

Steam locomotive climbing the slope toward Clogwyn station

Train	Adult	Children
Traditional Diesel, off-peak	£45	£35
Traditional Diesel, peak	£48	£38
Heritage Steam, off-peak	£62	£52
Heritage Steam, peak	£72	£62

There is also a cheaper option: a diesel train to Clogwyn station, from where you walk to the summit. Services run at fixed times; there are no open-dated tickets here.

Tours and tickets in Snowdonia

Guided tours, skip-the-line tickets and activities — most offers can be cancelled free of charge.

See offers on GetYourGuide

The widget loads once you give your consent.

⁉️🤔 Frequently asked questions

How much time do you need for Snowdonia?

Plan a full day, otherwise you will have to choose between the steam train and the mountain. The Ffestiniog Railway trip takes several hours, and the loop around Llyn Idwal will add another couple of hours. If you are coming from Manchester or Liverpool, leave early in the morning, the drive also takes time.

How do you get to Snowdonia without a car?

Trains run from Manchester and Liverpool to Bangor and Llandudno, and buses continue deeper into the park. Check the current schedule on the official Wales tourism portal. In high season buses run more often than in spring, so check times on the day of your trip and leave some buffer.

Do you need to book the steam train in advance?

On weekends and during school holidays the best seats sell out weeks ahead, so buy tickets online in advance on the operator's website. On weekdays outside the season your chances of buying a ticket on the spot are higher, but schedules and train compositions change, so check before you set off.

Is the route suitable for children?

The short ride to Tan-y-Bwlch and the loop around Llyn Idwal are fine for children without any special preparation. For the summit of Snowdon you need reserves of energy and warm clothing, because the weather in the mountains changes quickly.

When is the best time to visit Snowdonia?

May, June and September are good for hiking. In summer the park is crowded and parking lots fill up from the morning, and in winter some trains are suspended because of ice on the upper section.

In short: what to book

Snowdonia comes together as one packed day built around two anchors: the steam train and the mountain. Pick the format that matches your fitness level and book ahead.

First time without a car: the Ffestiniog steam train and a short ride to Tan-y-Bwlch.
You want mountains: the Cwm Idwal loop in the morning and the steam train in the afternoon, about an hour's drive between them.
Traveling with children: an easy walk to Llyn Idwal and a short railway ride.
You want a summit view: the Snowdon Mountain Railway train from Llanberis, buy tickets online.

Book Snowdonia tours on GetYourGuide: with a guide you will see more in one day and won't have to think about logistics.

Snowdonia: steam train route and hike to Cwm Idwal valley