SR CC1/CC2

The SR CC1 and CC2 (later renumbered 20001 and 20002) were two Co-Co electric locomotives built by the Southern Railway in 1941–45 for express passenger working on the SR's 660 V DC third-rail electrified routes, designed under Oliver Bulleid's direction as the SR's first main-line electric locomotives and intended to work the heavy Continental boat trains between London Victoria and Dover Marine that the SR's third-rail electrification was progressively extending. A third locomotive, 20003, was added in 1948 under British Railways.

Bulleid designed CC1 and CC2 as powerful Co-Co electrics — two six-axle bogies, all wheels powered, giving excellent adhesion for sustained high-speed working with heavy boat trains on the electrified Kent main lines. The SR's third-rail 660 V DC system, inherited from the various pre-Grouping electrifications that the SR had expanded and standardised after 1923, was the system that CC1 and CC2 used throughout their working lives, collecting current from the conductor rail through shoe gear on the bogies rather than from an overhead wire.

In service CC1 and CC2 — and the later 20003 — worked the SR's most prestigious electric duties including the Golden Arrow all-Pullman Continental express and the Night Ferry sleeping car service between London Victoria and Paris Nord via the Dover–Calais train ferry. These were among the most glamorous and commercially important trains in Britain, and the Co-Co electrics provided the traction with a power and smoothness that matched the prestige of the service. The class was withdrawn in the 1960s–70s; none was preserved.