 NDR continued to operate out of Hamburg, whilst the WDR was established in Cologne.The split was effective from 1 January 1956, although the station NWDR1 remained a joint operation with regional opt-outs.The NWDR television service also remained a joint operation, from 1 April 1956 under the name " Nord- und Westdeutscher Rundfunkverband" (North and West German Broadcasting Federation - NWRV).