Amtrak has received more than 20 proposals from private investors to help fund high-speed rail on the railway's Northeast Corridor. The $117 billion project would boost speeds to 220 mph. At least half the money will likely come from government sources. "We want to engage the private sector as much as we can," said Al Engel, Amtrak vice president of high-speed rail. The railway expects its losses to grow this year, even as ridership increases.