Among the practical devices used are removable bodies. The whole body of the truck may be swung by means of a crane from the chassis to a platform where it is loaded or unloaded while the truck with another body is proceeding on its way. Other bodies are so arranged on rollers that they may be readily rolled from the chassis to the platform. Railways are also taking advantage of removable bodies for the shipment of less than car-load lots. These bodies are made to fit a truck and also of proper sizes so that several of them may be nested or interlocked upon a flat car. One of these units or containers may be left for any length of time for loading then rolled upon the truck and off it to the steam train. At the other end of its journey it is rolled from the car to the truck and from that to the unloading platform with a great saving of time at each terminal. The New York Central railway places nine containers of 6000 pounds capacity on one flat car. These are unloaded by means of a crane in less than five minutes for each container, or the whole car in approximately forty minutes. By this means the railroad is able to take advantage of what has been called store-door delivery. Instead of the consignor hauling its goods to the station and unloading them on the platform to be loaded into cars by stevedores, transported, unloaded into the warehouse, and the consignee notified to come for them, the railway leaves a container which when filled is hauled by truck to the railway yard and in five minutes’ time placed upon the car, which upon reaching its destination is placed upon a truck and hauled to the consignee. Goods shipped in these containers which may be made of steel and securely locked are considered just as safe from predacious hands and the weather as in a way car, and possibly are safer. The demountable container which is rapidly coming into general use, and which has for some time been used by the New York Central Railroad and the interurban railways of Australia, consists of a large steel box or safe, the doors of which can be locked. When it is placed upon a steel flat-car with sides two feet high it cannot possibly be opened as the doors are on the side of the container. And it cannot be removed from the car without the use of a derrick, the top corners of the container being equipped with hooks for this purpose. The containers have a capacity of 438 cubic feet and will hold from 6000 to 8000 pounds of package freight. When the packages are locked and sealed within the containers they are safe from fire and rain as well as marauders. One flat-car will accommodate from 4 to 9 containers, depending upon their size.