A chronicle of the CTA substation project on the Red Line between Loyola and Morse stations in Chicago (with occasional posts about other construction projects)
Nice picture. Maybe that machine had something to do with removing the tree stumps.
That's exactly what it is doing: clearing the stumps and leveling the soil so that the large timbers can be placed there. That task is continuing today, so if you are in the neighborhood, you could probably peek through the fence and see it in action.
This blog exists for one purpose: to follow the progress of the CTA substation project. Your comments relevant to that topic are very welcome.