 Although the latter tramway closed in 1907 and was re-laid in 1919 as a standard-gauge siding of the Cambrian, this section survived until the early 1950s.The railway served the Ynys-y-Pandy Mill () a three-storey structure which processed slate from the Gorseddau Quarry.The mill was built in 1856-7 by Evan Jones of Garndolbenmaen and is believed to have been designed by James Brunlees.