Chicago Union Station
Here is a Milwaukee Road commuter train, at what I’m assuming is Chicago Union Station. We see here a couple of interesting things here: the locomotive is an F40C, of which not many were built (fifteen), as well as a Northern Pacific sleeping car, part of what I assume to be an Amtrak train of BN ilk.
More assumptions on my part: I gather that this locomotive was developed alongside that of the F40PH, or just prior to that much more successful four-axle design. (I recall seeing those units, brand spanking new, in 1976 or so.) This particular locomotive was built in April of 1974.
So, not a great photograph to be sure, but fun to lock down some details of the equipment I had not noticed at the time. I had just turned 15 and was on a trip to the Windy City for the first time.
One image by Richard Koenig; taken September 20th 1975.