![](http://www.alamy.com/thumbs/6/0C54237F-8399-4CBF-9D1F-971DC3BD8EF0/D5FTHH.jpg)
Indiana Harbor Belt RR, switchman demonstrating signal with a "fusee" - used at twilight and dawn - when visibility is poor. This signal means "back up." Calumet City, Ill. (LOC)
Indiana Harbor Belt RR, switchman demonstrating signal with a "fusee" - used at twilight and dawn - when visibility is poor. This signal means "back up." Calumet City, Ill. (LOC)
Size: 1237px × 1616px
Photo credit: © PF-(bygone1) / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: 1943, 20th, 20thcentury, archive, backup, belt, calumet, calumetcity, calumetcityil, century, circle, city, congress, cook, cookcounty, county, dark, dc:identifier=, dc:identifier=httphdllocgovlocpnpfsac1a34694, delano, engineer, exposure, fusee, harbor, harbour, historic, history, il, illinois, indiana, indianaharborbelt, indianaharborbeltrr, jack, jackdelano, january, january1943, lamp, library, libraryofcongress, light, lightpainting, long, longexposure, painting, photograph, railroad, road, rr, signal, tower, vintage, water, watertower, xmlns:dc=, xmlns:dc=httppurlorgdcelements11