National Geographic : 1936 Nov
Photograph byTheodore Horydczak CHOKE THIS BOTTLENECK AND CITIES NORTH OF WASHINGTON WOULD GO ON SHORT RATIONS OFFRUITS AND VEGETABLES Potomac Yards, at Alexandria, Virginia, form the funnel of Atlantic seaboard rail freight traffic. There are 88 miles oftracks inthis area-tracks forreceiving, for classifying, and for distributing freight cars in the north-south movement of five railroads. Humps, retarders, and inspection pits (page 576) facilitate the distribution of the cars into remade trains. In the busy perishable season more than 4,000 cars are handled here every 24hours (page 563).