San Francisco is considered an especially environmentally friendly city. The urban environment is characterized by an extensive public transport system. In September 2014, San Francisco's Municipal Transportation Agency (SFMTA) has awarded Siemens a contract to deliver an initial 175 light rail cars at a value of USD648 million. The order included an option for additional 85 cars. One year later, SFMTA exercised its option for another 40 light rail vehicles for the public mass transit network. This is one of the biggest orders for light rail cars ever placed in the USA. The trains are being built in the Siemens plant in Sacramento. Today, every third tram or light rail vehicle in the USA is made by Siemens.