The Ffestiniog Railway (Welsh: Rheilffordd Ffestiniog) is a narrow gauge heritage railway, located in Gwynedd in Wales. It is a major tourist attraction located mainly within the Snowdonia National Park.
The railway is about 131⁄2 miles (21.7 km) long and runs from the harbour at Porthmadog to the slate mining town of Blaenau Ffestiniog. The line travels through mountainous scenery and is single track with passing places. The track gauge is 1 ft 111⁄2 in (597 mm). The first part of the line runs along a 1 mile (1.6 km) long embankment called "the Cob", which is the dyke of the Traeth Mawr "polder".
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