Illinois Transportation Secretary Tim Martin says it'd be difficult to justify massive new expenditures until Amtrak's status is known.
Amtrak's future is unclear because President Bush proposed last month that the federal government should largely withdraw from the passenger rail business.
Federal, state and private sources have spent more than $129 million to develop high-speed rail in Illinois. Illinois spent $81 million of that total.
The Chicago-based Midwest High Speed Rail Coalition says completing Illinois' high-speed rail line would cost about $200 million, plus as much as $150 million more for train engines and cars.