Pocket Underground map, 1911.

This geographic paper edition of the Underground map shows the Railway lines belonging to the Underground Group as well as the Central London Railway and Metropolitan Railway lines. Each line is represented by a different colour, other railways are marked with lighter blue lines. General geographic features such as roads and parks are also included in more detail and more obvious than in previous editions of the London Underground Railways series of maps. This map shows the Central London Railway extension between Bank and Liverpool Street under construction as a broken blue line. Lines which are served by two railways use the colours of both lines and dual interchanges are shown as solid circles with one colour in the centre and the other as a circular border. Places of interest and exhibition grounds are marked as yellow and red circles. The border of this map is green with the title in the top right hand corner. The reverse is printed in green and has details about the Underground Railways and timetables, lists of main line stations, historic buildings, museums, galleries, palaces, theatres, music halls, sports grounds, parks, and a theatre plan.