During the property boom of the 1980s a large office block was built above the platforms, but remarkably trains continued to use the station while it was being built. The station originally had eight platforms, but a refurbishment in the late 1990s removed Platform 1, with the result being that the remaining platform numbers were all reduced by one - causing temporary confusion for commuters.
The station connects the south side of the "City of London" to south and south east London via London Bridge. Some services run directly into Cannon Street from Kent and East Sussex, but only during rush hours. Trains cross the river on the Cannon Street Railway Bridge.
The tube station is on the District and Circle lines. Entrances are located on Cannon Street, Dowgate Hill, and on the main-line concourse upstairs at the mainline station, providing an interconnection for commuters.