President Joe Biden is famous as a supporter and patron of passenger trains, but advocates hoping he would jump-start high-speed rail say his manufacturing policies will hinder the climate-friendly transportation. Biden’s strengthening of Buy America provisions could make high-speed rail impossible to build in the U.S. and stymie a transit mode that would cut automobile and aviation emissions, experts said. “Trains capable of going 200 miles per hour are only made in a couple places in the whole world,” said Andy Kunz, president of the U.S. High Speed Rail Association, an advocacy group. “You stand behind it and say, ‘It has to be 100 percent made in America,’ you’re not going to get a [high-speed] rail system.”