Together with this freight handling center should be a harbor in connection with each of the two rivers, the Chicago and the Calumet. These two harbors should be connected underground or overhead by freight ways operated electrically, and they should also be connected with the freight handling center. The four elements, namely, freight center, two harbors, and the connecting systems, will then form one complete machine for doing almost all the transportation of goods for Chicago for all time. No doubt the present tunnel railway system should be tied up with and form part of this machine: all probably to be owned jointly by some general utility corporation. In such case any merchant or manufacturer, located wherever he may be, could, in the shortest space of time and at lowest cost per ton, receive goods from the great depository (the freight center) or send them to it for entraining. The present underground system of tunnels already extends under all of the streets in the old business district of Chicago, and is extending on the North, South, and West Sides. It is connected with all of the railway freight stations, its floor is about 40 feet from the street surface, and is connected at that level with chambers under many of the leading commercial and manufacturing establishments and office buildings of the city, from each of which freight elevators deliver goods to and from the shipping-rooms above. Any existing tunnel system can be utilized as far as it will go in carrying out a complete system of underground distribution. The freight handling center should become a perfect machine in itself. Trains of freight cars coming to or going from the city should be handled there, so that the individual cars may be placed at the particular warehouse from which goods are to come, and from these cars the new trains should be made up in station order. No considerable car supply should be kept on hand in this freight yard. In the course of time, when the freight business of Chicago shall have greatly increased, the present freight-car yards will be needed for storage of cars, and holding those needing repairs or rebuilding. The yards will then perform an important function, for when more cars are needed at the great central freight machine, they can be sent thither from each of the separate yards. Should a surplus of cars exist at the center of any road, this surplus can be withdrawn to that road’s own yard.