Cei Llydan is an intermediate railway station on the Llanberis Lake Railway (LLR), located in Llanberis, Gwynedd, Wales. Most of the LLR was laid around 1970 on part of the trackbed of the closed and lifted Padarn Railway. The line opened between Gilfach Ddu (LLR) and Cei Llydan on 28 May 1971, being extended northwards to Penllyn (LLR) in 1972, changing Cei Llydan from a terminus to a through station. For thirty years Gilfach Ddu (LLR) was the new line's southern terminus, situated a short distance south of the site of the Padarn Railway's former workmen's station, also named Gilfach Ddu. In 2003 a wholly new extension was opened south westwards, with Llanberis (LLR) station as the line's new southern terminus. With this extension Gilfach Ddu (LLR) changed from a terminus to a through sta