On 5 November 1923 new stations were opened on the Ealing extension at North Acton and West Acton. They were built to serve residential and industrial developments around Park Royal and, like East Acton, the station buildings were basic structures with simple timber shelters on the platforms. The poor location of British Museum station and the lack of an interchange with the GNP&BR's station at Holborn had been a considered a problem by the CLR almost since the opening of the GNP&BR in 1906. A pedestrian subway to link the stations was considered in 1907, but not carried out. A proposal to enlarge the tunnels under High Holborn to create new platforms at Holborn station for the CLR and to abandon British Museum station was included in a CLR bill submitted to parliament in November 1913. This was given assent in 1914, but World War I prevented any works taking place, and it was not until 1930 that the UERL revived the powers and began construction work. The new platforms, along with a new ticket hall and escalators to both lines, opened on 1933, British Museum station having closed at the end of traffic the day before.