Willow is a station on the Overbrook branch of the Port Authority of Allegheny County's light rail network. It is located in Castle Shannon, Pennsylvania. It is a transfer point between the Beechview (serving Castle Shannon, Mt. Lebanon, Dormont, and Beechview) and Overbrook (serving Overbrook, Carrick, Bon Air, and Belzhoover) lines. The station's name was derived from Willow Ave, the street that runs parallel with and across the light rail. No parking is available at the site and because park and ride commuters can more conveniently reach the nearby Memorial Hall station, Willow almost exclusively serves nearby apartments and individuals switching trains.