 Located at the junction of two earlier tube railway schemes , the station was opened in 1906 by the Great Northern , Piccadilly and Brompton Railway ( GNP & BR ) . The station entrances and below ground circulation were largely reconstructed for the introduction of escalators and the opening of Central line platforms in 1933 , making the station the only interchange between the lines . Before 1994 , Holborn was the northern terminus of the short and little @-@ frequented Piccadilly line branch to Aldwych and two platforms originally used for this service are disused . One of the disused platforms has been used for location filming when a London Underground station platform is needed . 
