Nagpur – Shirish Apte, deputy general manager, Nagpur Metro Rail Corporation Limited likened CCTV to the immune system of the human body. In answer to a query on the security and safety measures, Apte said CCTV surveillance shall be available on all Metro trains and stations. He said, "We fall sick because our immune system fails. There are signs and symptoms if we catch any virus or disease. So we take medicine and get back on the track. It's same with any system, it gives signs before it fails. So we will be constantly observing these signals and take care of it.

Credits:http://timesofindia.indiatimes.com/city/nagpur/an-exciting-journey-on-metro-rail/articleshow/56575637.cms