Completion of the City Circle loop did not occur until 30 years after St James station opened. Construction of the western city line as far as Wynyard was completed in 1932, but completion of the line connecting Wynyard and St James via Circular Quay, begun in 1936, proved problematic. Construction was halted during World War II and was intermittent after it resumed in 1945 due to inconsistent funding. The above-ground viaduct and Circular Quay railway station were finally completed in 1956, allowing trains to make a single circuit through the city and return to the suburbs without having to terminate.