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.