The document summarizes key details about the Delhi Metro rail system including: - It was established in 1995 and began construction in 1998 to serve Delhi and surrounding areas. - It currently has 6 lines and 135 stations serving over 1.6 million daily riders. - Future expansion is planned to add more lines and stations through 2021 to further improve transit access. - Safety and security features like CCTV, intercoms, and security forces help ensure passenger safety.