WEBMuni Metro is the United States' third-busiest light rail system, operating a fleet of 151 light rail vehicles (LRV) with an average weekday ridership of 173,500 passengers. The Muni Metro system consists of 71.5 miles (115.1 km) of standard-gauge track, seven light rail lines (six regular lines and one peak-hour shuttle), three tunnels, nine subway stations, …