Tregarth station was situated on the single-track Bethesda branch of the London and North Western Railway. The station opened in 1884. The railway closed to passengers in 1951, and closed completely in 1963. The station has been demolished, with only a short section of the platform's west end remaining.

Sources include:
www.disused-stations.org.uk

N Vousden, RCAHMW, 18 October 2013