A RJ Corman switcher hauling supplies to their yard.
A few years ago either the NS or CSX had about a dozen full coal hoppers slide down an embankment in Columbus dumping their loads on the street. They brought in RJ Corman to clean up the mess and rebuild the tracks.
I think it is their engines that I see on the south side of Aurora, IL. They are used to switch local industries that feed into the BNSF at the west end of the famous "race track" 3-track mainline. I'm guessing that BNSF doen't want to bother with switching these local plants and Corman saw an opportunity?