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
Trams in Sydney Street, North Sydney over a now-demolished steel arch bridge over the Harbour Bridge Roadway, then over the eastern side of the harbour bridge (now used by the Cahill Expressway), through a tram platform at Milsons Point similar to the railway station on the opposite side, and dived underground into platforms 1 and 2 of Wynyard station. These platforms were converted into a car park after the tramway's closure in 1958. Wynyard station's railway platforms are thus numbered 3-6. The line along Military Road, opened in September 1893, was the first permanent electric tramway in Sydney and New South Wales. The