A high-speed rail line between Chicago and St. Louis would generate enough revenues to pay for new trains and improvements on existing rail lines, as well as for the new line itself, according to a study released last week by the Illinois Department of Transportation.

Martha Schiebel, a spokeswoman for the department, said that bonds would finance most of the highspeed rail project, which could cost up to $355 million. The remaining costs probably would be covered by federal funds, she said.

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