The Talyllyn Railway is a narrow-gauge railway in Wales that runs from Tywyn to Nant Gwernol near Abergynolwyn. It was opened in 1865 to transport slate from the Bryn Eglwys quarry. Despite facing challenges, the line remained open and was preserved in 1951 by volunteers, making it the first heritage railway in the world. Since then, the railway has operated as a tourist attraction, expanding its rolling stock and even inspiring the fictional Skarloey Railway in The Railway Series books. In 1976, an extension to Nant Gwernol was opened, and in 2021, the railway was designated a World Heritage Site.