Railways in Sydney on 9 December 1926 with the first suburban electric service running between Central station and Oatley on the Illawarra line. In the same year, the first underground railway was constructed north from Central station to St James in Sydney's central business district. Electric trains that had previously terminated at Central station continued north, diving underground at the Goulburn Street tunnel portal, stopping at Museum station and then terminating at St James. Other lines were soon electrified. Also, in conjunction with the construction of the Sydney Harbour Bridge which opened in 1932, an additional four-track underground line was constructed from Central
Sydney Harbour Bridge the T1 North Shore Line for Sydney Trains. The main roadway across the bridge is known as the Bradfield Highway and is about long, making it one of the shortest highways in Australia. The arch is composed of two 28-panel arch trusses; their heights vary from at the centre of the arch to at the ends next to the pylons. The arch has a span of and its summit is above mean sea level; expansion of the steel structure on hot days can increase the height of the arch by . The total weight of the steelwork of the bridge,