Industrial estates such as Kwinana, Welshpool and Kewdale were post-war additions contributing to the growth of manufacturing south of the river. The establishment of the Kwinana industrial area was supported by standardisation of the east–west rail gauge linking Perth with eastern Australia. Since the 1950s the area has been dominated by heavy industry, including an oil refinery, steel-rolling mill with a blast furnace, alumina refinery, power station and a nickel refinery. Another development, also linked with rail standardisation, was in 1968 when the Kewdale Freight Terminal was developed adjacent to the Welshpool industrial area, replacing the former Perth railway yards.