WASHINGTON, June 5 -- Amtrak (National Railroad Passenger Corp.) issued the following news: * * * Heartland Flyer Faces Imminent Suspension without Funding * While Amtrak operates the service, states are legally required to fund costs For more than 25 years, the Heartland Flyer has been a vital link between Dallas-Fort Worth and Oklahoma City along the I-35 corridor. Operated in partnership with the Texas Department of Transportation (TxDOT) and Oklahoma Department of Transportation (ODOT),  more