Toledo Lake Erie & Western Alco S4 5109 sports this structure, which I can only surmise is used to protect the engine during the winter months. But it's only a guess; any clarification is more than welcome. It's their only working locomotive, and is parked just north of US24 at Yawberg Road, about a mile northeast of Grand Rapids, Ohio. Two more Alcos are stored just to the west, at the end of track at Jeffers Road, just north of the US24 overhead.