Film about the city and industry of Chicago in Illinois, United States. Automobile and pedestrian traffic on the roads and streets in Chicago. Skyscrapers and the Wrigley Building on Michigan Avenue. Exterior of the Merchandise Mart building. Interiors of a factory in Merchandise Mart. Hot metal being lifted from a furnace. Steel manufacturing plant scenes. Material being heated in a furnace. Men work to assemble parts of a machine in a factory. Women work assembling new typewriters in a factory. Men paint and prepare a Pullman Palace Car railroad car at the Calumet Works near Lake Calumet - the railroad train car's main manufacturing plan. It is marked as being for the New York Central railroad. The assembly line of diesel railroad locomotive trains in La Grange. A newly manufactured locomotive pulling train cars as it exits the factory area.