Senator Dick Durbin points out that Metra, Amtrak and Union Station are working to wipe out a diesel pollution problem that's been causing a possible health risk for passengers.
"This threat is not just a matter of air that's dirty. It's a threat that includes cancer, heart attacks, respiratory disease, diabetes and brain damage that have been associate with these types of emissions," said U.S. Senator Dick Durbin (D-Ill.).
Amtrak had sued the old post office and its owner for failing to maintain its ventilation ducts and fans, which help pull the diesel fumes out of union station's tunnels.
Metra has installed air filters in its train cars to help reduce levels of pollution and has also switched to cleaner fuel for its trains.