33,000 CCTV cameras will form a new hub giving the British Transport Police access to security cameras across the whole of the railway network in the South East and London Underground.
The system will allow detectives to track individuals who they believe are acting suspiciously in real time.
Officers could then be sent to the location if it is believed a crime has been committed.
The London CCTV hub cost £14m and has been built in Victoria. The BTP say it will help combat crime on the transport network by providing evidence as well as acting as a deterrent.