As state officials accelerated their effort to design a high-speed rail system in 2010, they were approached by the renowned French national railway with a suggestion: The project could use the help of an experienced bullet train operator.

Until the end of last year, SNCF, the developer of one of the world's most successful high-speed rail systems, proposed that the state use competitive bidding to partner with it or another foreign operator rather than rely on construction engineers to design a sophisticated network for 200-mph trains.

The approach, the French company said, would help the California High-Speed Rail Authority identify a profitable route, hold down building costs, develop realistic ridership forecasts and attract private investors — a requirement of a $9-billion bond measure approved by voters in 2008.

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