Penfield railway line is a defunct railway in northern Adelaide which was built mainly for industrial purposes during World War II. It started just north of Salisbury station on the Gawler line, running north-west, then north, through defence land in what is now Edinburgh. The line served four stations: Hilra, Penfield 1, Penfield 2, and Penfield 3. It was double track for the whole length, with a balloon loop at the end to allow trains to turn around.