As late 2016 approached , the agency further delayed opening the IOS between Northern Santa Rosa and Downtown San Rafael until " late spring 2017 . " A crankshaft failure on a diesel engine used in the near-identical Nippon Sharyo diesel multiple unit trains operating in Toronto necessitated all of SMART 's cars to be recalled for crank replacements , according to SMART management . The agency additionally had been experiencing problems with warning systems at some grade crossings , and had not fully completed its approval process with the Federal Railroad Administration . The 2017 California floods caused damage to the Puerto Suello Hill Tunnel , further delaying testing of the line
2017 California floods
2017 California floods
Sonoma–Marin Area Rail Transit