Between 1926 and 1928 the Southern Railway electrified the SE&CR suburban lines at London Bridge using a third rail system, adapting the existing LB&SCR routes to it at the same time.
Mellem 1926 og 1928 elektrificerede Southern Railway SE&CR's forstadsbaner ved London Bridge med tredjeskinnesystemet, og ændrede de eksisterende LB&SCR-ruter til samme system.