Mumbai, April 30: Mumbai Metro One announced on Monday that it has achieved the 400 million passenger mark on its 1,423rd day, which is almost within four years of its operations. The Reliance Infrastructure-promoted Mumbai Metro One, the state’s first, has now emerged as the preferred choice of daily commute with people opting for it to travel to and from their homes and offices, said an official spokesperson. While the first 100 million passenger mark was achieved in 398 days, the second 100 million mark came in 388 days, followed by the third 100 million peg in 337 days and the latest 400 million was achieved in 300 days. “We have redefined MRTS commuter experience in the country. As a transport utility we have sought to delight our commuters with value-added services besides comfort and safety,” the spokesperson said.