Here is another view of that service road that runs all the way from the yard to the Chicago Amtrak station. Shops are on the left in this photo with some employee parking on the right. The Chicago skyline is in the background.
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.