I Saw a Freight on the UP North Today

I finally saw one! :smiley: It was a GP15 leading approx. 4 hopper cars and a CN&W caboose I’ve never seen before. I twas heading southbound. What could have been its purpose?

And the location is???

I suspect that it’s a work train, and that the hoppers are probably ballast cars. Lots of action coming to UP North:

http://metrarail.com/content/dam/metra/documents/Bi_Level/OTBLAugust2010x.pdf

Wilmette, IL.