The Piccadilly line began as the Great Northern, Piccadilly & Brompton Railway (GNP&BR), one of several railways controlled by the Underground Electric Railways Company of London (UERL), whose chief director was Charles Tyson Yerkes, although he died before any of his schemes came to fruition.
Piccadilly line begyndte som Great Northern, Piccadilly & Brompton Railway (GNP&BR), en af adskillige jernbaner, der blev kontrolleret af Underground Electric Railways Company of London (UERL), hvis administrerende direktør var Charles Tyson Yerkes, som dog døde før nogen af hans planer blev realiseret.