 Security on the Delhi Metro is handled by the Central Industrial Security Force ( CISF ) , who have been guarding the system ever since they took over from the Delhi Police in 2007 . Closed @-@ circuit cameras are used to monitor trains and stations , and feed from these is monitored by both the CISF and Delhi Metro authorities at their respective control rooms . Over 3500 CISF personnel have been deployed to deal with law and order issues in the system , in addition to metal detectors , X @-@ ray baggage inspection systems , and dog squads which are used to secure the system . About 5 @,@ 200 CCTV cameras have been installed , which cover every nook and corner of each Metro station . Each of the underground stations has about 45 to 50 cameras installed while the elevated stations have about 16 to 20 cameras each . The monitoring of these cameras is done by the CISF , which is in charge of security of the Metro , as well as the Delhi Metro Rail Corporation . <unk> are provided in each train car for emergency communication between the passengers and the train operator . Periodic security drills are carried out at stations and on trains to ensure preparedness of security agencies in emergency situations . DMRC is also looking at raising the station walls and railings for the safety of passengers . 
