SFMTA signed a $US 648m contract with Siemens in July 2014 for 175 S200 SFs, and exercised a $US 210m option for 40 additional vehicles in January 2015. A second option for 40 vehicles was subsequently taken up in June 2015, leaving SFMTA with one remaining option for 45 LRVs.

The prototype vehicle will be delivered in December and a further 23 units are due to arrive by 2018.