The station complex is an important part of the larger Sydney Harbour Bridge and the electrified City Underground Railway scheme and has associations with prominent persons such as JJC Bradfield, chief engineer and designer of the Sydney Harbour Bridge and city underground and organisations such as the Department of Railways and represents the culmination of many years of political lobbying for a city railway system. The construction of the city underground and position of St James station encouraged the retail and commercial development of the Sydney CBD in the late 1920s and 1930s, with large department stores constructed around the stations.