 The Tremadoc tramway (sometimes known as the "Llidiartyspytty Railway") was built by William Madocks sometime before 1842, and possibly as early as the 1830s.It connected the ironstone mine at Llidiart Yspytty to Porthmadog harbour.Little is known about the operation of the railway, though it is believed to have been horse worked with similar track and rolling stock to the nearby Nantlle Railway.