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Meet Muni’s next-generation of Metro light-rail trains, the Siemens S200. The SFMTA Board of Directors will vote on Tuesday to purchase between as many as 260 of the new trains to replace the existing 151 train fleet…

It made a bit of noise last year when the maker of Muni’s current light-rail fleet was disqualified from bidding on the next ones. Since then the SMFTA has been evaluating the options from those which did qualify, opting for off-the-shelf models with a proven track record of reliability.

24 trains will arrive by 2018 to add capacity for the opening Central Subway and a different step mechanism reduces the 200 parts - and points of failure - involved down to just 20.