Waste from the holding tanks on the train that is pumped out by the trucks is then dumped in the big square hole in the floor of this building. This is where it is treated before it is dumped into the Chicago sewer system.
The photos in this slide show were taken in the mid-1990's by Steve Grande on his Amtrak travels throughout the nation. The size of the photos is purposely smaller as disk space was expensive and download speeds were slower at that time.
