 LSWR metro area was initially electrified, soon followed by conversion LBSCR's 6.6kV AC Overhead electrified London Metro lines and then the SECR's metro lines around London in the 1920s.The 1930s saw mainline electrification of the Brighton Main Line and the Portsmouth Direct Line with associated several surround lines (such as the East and West Coastways).Outer suburban electrification was also extensive (e.g.