  
            Federal Aid Project viaduct, 
            Pawnee County - 1910's | 
             
            Railroad crossing, Meadow Grove-Tilden, 
            showing accident prevention experiment - 1920's | 
             
            5-car gravel train, 
            Central City-Chapman - 1921   
              North Platte - 1930's 
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            Dedication of viaduct, 
            Grand Island - 1932   
              Railroad crossing in Potter 
              1940 
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