Railway electrification in Great Britain

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40% (3,062 miles / 4,928 km) of the British rail network is electrified and 60% of all rail journeys are by electric traction (both by locomotives and Multiple Units).

650 to 850 V DC Third rail

LWSR / Southern Railway / Southern Region of British Railways - everything but a few freight branches, Marshlink, North Downs Line, Uckfield branch of the Oxted Line and services through Salisbury.
Northern City Line - ECML to Moorgate - A former main line taken over by the Underground and turned into a tube line. It was however isolated by the abandonment of the 1930s "New Works" programme (and the development of the greenbelt). Tube services were further truncated by the new Victoria Line in 1964 (which shortened the northern end of the line). The remainder was handed over to BR in 1975 in conjunction with electrification of ECML to allow dual voltage (ie both 25Kv AC Overhead and Third Rail DC) commuter trains into London. A link with the ECML was made to enable this. Presumably third rail was chosen as the tunnels were of too narrow a bore to allow overhead lines to be installed (as they are on the Snowhill, Thameslink route.)
Merseyrail Electrics (Merseyrail)
Glasgow Subway ?
Tyneside Electrics - 630V DC(de-electrified by BR in 1960 then turned into Tyne and Wear Metro )

Manchester-Sheffield-Wath line, also known as the Woodhead Line, closed in 1981
Shenfield Metro (Great Eastern Main Line) - converted to 25 kV AC, initially with some sections at 6.25 kV
Tyne and Wear Metro - over former Tyneside electrics
Newport - Shildon line (closed in the 1930s)

All 6.25 kV sections in these two systems have been converted to 25 kV

LTS - converted from 6.25 kV AC overhead
GEML - converted from 6.6K V AC overhead and 1500 V DC overhead
ECML - in the 1980s
MML (only to Bedford) - in the 1980s
WCML - in the 1950s under the 1955 BR modernisation plan to Birmingham (new Street) / Liverpool (Lime Street) / Crewe / Manchester (Piccadilly). Extended in the 1970s to Glasgow. In 2003 Crewe to Kidsgrove section of the Crewe to Derby Line was electrified as a diversionary route for the WCML.
Glasgow Suburban (see SPT and Transport in Glasgow) - started in the 1950s under the 1955 BR modernisation plan.
Leeds to Skipton (Airedale Line) / Leeds to Bradford ( Wharfedale Line )
Manchester - Glossop - Hadfield (converted from 1,500V DC)
Birmingham Cross-City Line
GWML (only to Heathrow - see Heathrow Express and Heathrow Connect)
CTRL - employing auto-transformers
Crossrail (Proposed)