Take a further look down the spur and you'll see what I mean. I imagine that it is just maintained to give MOW stuff a place to get off the main. Since we're on this topic, I think there used to be a lumber yard on this same spur and I think I saw a flat there once a long time ago. I believe it was a Hines lumber but I could be wrong. Either way, that too is gone. As far as the electric company goes that switch has been removed too. I did, however, see a MOW flat at the Winnetka or Hubbard Woods team track during my yearly pilgrimage at Thanksgiving. I imagine something UP related would have to make a trek to pick it up. Other than that, it's all Metra all the time.
On a somewhat related note the Hines in North Chicago also went out of business leaving only, Blommer Chocolates, Morton Salt
Chicago Tribune, Abbott Labs, and North American Salt as industries on the entire route.
-Matt