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 1,000 buses, 200 streetcars, and 40 cable cars see active duty. Muni's forty cable cars represent one of the oldest, last remaining public transportation fleets of cable cars remaining in service around the world. Muni's fleet of diesel-electric hybrid buses is the third largest in the nation, and there are plans in place to replace the existing diesel fleet with hybrid buses. Continuing the trend, Muni's fleet of electric trolleybuses is one of the oldest and largest remaining in the United States. A summary of the current and historic vehicles follows below.