were built in Florin, California, but they differ slightly from the cars Utah received in detail, including having more air-conditioning units. They were delivered in October 2012 and entered service that December. The H2 series cars are shorter than the H1 series, at in length, accommodate slightly fewer passengers (60 seated, 225 maximum), and have a lower maximum speed of . Externally, the H2 series are distinguishable by their flatter cab ends and circular headlamps, with the electronic destination sign (which use colored dots to indicate the line) conventionally mounted above the cab. Like the H1 series, they are normally used only on the Red Line and can be operated as single cars or in two-car trains. The H1 and H2 series are electrically compatible and can operate together in the same train. H3 series In September 2011, METRO approved the purchase of 39 vehicles from CAF upon receipt of a new proposal compliant with Federal Transit Administration (FTA) and "Buy America" guidelines. The first six of these cars were delivered in January 2015 and entered service shortly afterwards. The H3 series cars, built in Elmira, New York and based on the CAF Urbos platform used in cities across Europe and Asia, are similar in size and capacity to the H1 series with a length of and accommodating a maximum of 242 passengers (64 seated), but are distinguishable by their boxier design and framed window panes. They are in operation on all three METRORail lines and can couple to form two-car trains; however, the H3 series is electrically incompatible with the older types and cannot operate with them in the same train. H4 series In February 2019, METRO ordered 14 additional Siemens S700 vehicles (H4), with interior modifications designed to improve passenger flow compared to the agency's prior H1 and H2 series S70s. These vehicles result from the reassignment of options from Minneapolis–Saint Paul Metro Transit in May 2018. Metro Transit previously had signed a contract with Siemens to deliver 27 low floor S70 LRVs with options for up to 50 additional vehicles in 2016. These new vehicles would be used for the Southwest LRT (Green Line) and Bottineau LRT (Blue Line) extension projects; subsequently, Metro Transit determined they would only need 27 vehicles for Southwest and 28 vehicles for Bottineau, leaving 22 options unexercised, and METRO requested the transfer of 14 of those options in 2018. Siemens re-designated the