I was driving westbound on Indiana State Road 28 during the evening of August 30, 2014, when I noticed a NKP engine setting next to a crossing in Tipton, IN. Fortunately, traffic was light, and I was able to quickly make a left-hand turn into a parking lot next to the tracks. It had started to move so I grabed this picture.
Indiana Transportation Museum. I learned that ITMZ 426 is a 1953 EMD GP-7L. Not only does it have the sheet metal of the original Nickel Plate locomotive, it evidently still has the original 16-cylinder EMD 567BC prime mover. Since this engine did not smoke when it started pushing the train, the particulate quality of the exhaust must be a matter of maintenance rather than age.