The Bridgewater railway line is a former passenger railway service on the Adelaide to Wolseley line in the Adelaide Hills. It was served by suburban services from Adelaide. On 26 July 1987, the service was curtailed to Belair and renamed Belair railway line. In 1995, the Adelaide-Wolseley line was converted to standard gauge as part of the One Nation infrastructure program, disconnecting the abandoned Bridgewater line stations from the broad gauge suburban railway system.