the talyllyn railway () is a narrow-gauge preserved railway in wales. it runs for from tywyn on the mid-wales coast to nant gwernol near the village of abergynolwyn. the line was opened in 1866 to carry slate from the quarries at bryn eglwys to tywyn. it was the first narrow gauge railway in britain authorised by act of parliament to carry passengers using steam haulage. despite severe under-investment, the line remained open, and in 1951 it became the first railway in the world to be preserved as a heritage railway by volunteers.