Rochelle Webcam loco question

If you hurry and check the Rochelle snapshots, the one for Feb 26 at 7:43 AM, a single loco seems to be coming down the UP track. The front half is blue, and the rear seems black. Any idea what loco that is, what railroad it’s for, and why it’s got a differet color rear? Thanks.

I didn’t get to see the photo in question, but could it have been an engine with EMD livery of blue and black with some silver? - a.s.

I just looked, it is the MoPac Heritage unit but it is traveling alone.