Cannon Street Station was constructed as an alternate terminal serving London, with line connecting at London Bridge with main line from Charing Cross Station.
MAIN LINE: Cannon Street-London Bridge
2 tracks Cannon Street-London Bridge
All lines DC electrification.
Number Of Platforms/Tracks: 7
Platforms numbered east to west
Platform 1-7 - Main Line
Cannon Street Station
Wikipedia link containing further station information and history.
Zoomable Google Maps along the various lines, from Charing Cross Station and Cannon Street Station.