The Belair railway line is a suburban rail commuter route in the city of Adelaide, South Australia, that runs from the Adelaide station to Belair in the Adelaide Hills via the Adelaide-Wolseley line using diesel 3000/3100 class railcars. Prior to 1995, this part of Adelaide-Wolseley was a two-track broad gauge line. In 1995, Adelaide-Wolseley was converted to standard gauge meaning Adelaide to Belair is now effectively two separate single-track lines running in parallel: the Belair commuter line (still broad gauge) and the Adelaide-Wolseley standard gauge freight line.