The high-speed rail authority adds 12 months to the schedule for 130 miles of Central Valley track, meaning it would be finished by December 2017 rather than a year earlier.
"We are going to get lower bids, save some money and still meet all of our deadlines," he said. "It is a good business move."
Construction industry experts have said that the job of building the $6 billion of track through the Central Valley would require spending $3.5 million per day, one of the fastest rates of transportation project spending in history. The authority put the number at $2.7 million per day, still high by U.S. standards.