The Central London Railway used colour illustrations in their 1905 poster, and from 1908 the Underground Group, under Pick's direction, used images of country scenes, shopping and major events on posters to encourage use of the tube.
Central London Railway benyttede farvede illustrationer i deres plakat fra 1905, og fra 1908 benyttede undergrundsgruppen under Picks ledelse billeder af landskaber, shopping og store events på posters for at opfordre til brug af The Tube.