With five different modes of transport from many different vendors, the San Francisco Municipal Railway or Muni as it is commonly known, runs one of the most diverse fleets of vehicles in the United States. Roughly 800 buses (500 diesel buses and 300 trolleybuses), 200 streetcars and 40 cable cars see active duty. Muni's cable cars constitute the oldest and largest such system remaining in service in the world and is the only one still running with manually operated cars in street traffic. Its fleet of electric trolleybuses is the largest in the United States. The 30- and 40-ft diesel/hybrid buses are numbered in the 8000 series, the 60-ft articulated diesel/hybrid buses in the 6000 series, the 40-ft trolleybuses in the 5000 series, the 60-ft articulated trolleybuses in the 7000 series, an