Belt Railway of Chicago track maintenance vehicle. Cicero Illinois. November 1988., a photo by Eddie from Chicago on Flickr.
I took this photograph, way back in November of 1988.
Facing south and looking down from the West 31st Street overpass bridge east of South Cicero Avenue, a Belt Railway of Chicago self propelled track machine heads south, more than likely enroute to the BRC's Clearing Yard near Chicago Midway Airport.