Historically the London & South Western Railway.
From Waterloo to Clapham Junction, both Main Line and Windsor Line parallel, with total 8 tracks.
MAIN LINE: Waterloo-Basingstoke and beyond
4 tracks Waterloo-Basingstoke
From south to north, pairs of tracks identified as Slow, Fast (east of Earlsfield).
Inside tracks identified as Fast, outside tracks identified as Slow (west of Earlsfield).
Additional Lines:
Woking-Guildford-Havant
Alton
Reading-Basingstoke (diesel)
Epsom-Dorking (shared with Southern trains)
Chessington
Shepperton
Hampton Court
Cobham-Guildford
Leatherhead-Effingham
All lines 2 tracks unless noted. All lines DC electrification unless noted.
WINDSOR LINE: Waterloo-Reading
4 tracks Waterloo-Barnes, 2 tracks beyond
Inside tracks identified as Fast, outside tracks identified as Slow.
Additional Lines:
Hounslow
Twickenham-Teddington
Staines-Windsor
Weybridge
Ash Vale (from Ascot)
North Downs (Dorking-Guildford-Wokingham/diesel)
All lines 2 tracks unless noted. All lines DC electrification unless noted.
Number Of Platforms/Tracks: 24
Platforms numbered south to north
PLATFORMS/TRACKS
West of Waterloo Station are the four track Main Line and Windsor Line, total 8 tracks. On the main line, the four tracks are sorted by Slow to the south and Fast to the north. But near Earlsfield is a flyover for the Up Slow track over the Fast tracks. West of there, the inside tracks are Fast and the outside tracks are Slow.
Immediately west of Waterloo Station on the Windsor Line, the inside tracks are Fast and the outside tracks are Slow. From 1994 to 2007, the Eurostar Channel Tunnel trains used Waterloo Station, and the Windsor Line a short distance of the station.
Waterloo Station
Wikipedia link containing further station information and history.