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Transloading, also known ascross-docking, is the process of transferring ashipment from one mode oftransportation to another. It is most commonly employed when one mode cannot be used for the entire trip, such as when goods must be shipped internationally from one inland point to another. Such a trip might require transport bytruck to anairport, then byairplane overseas, and then by another truck to its destination; or it might involve bulk material (such ascoal) loaded torail at themine and then transferred to aship at aport. Transloading is also required at railroadbreak-of-gauge points, since the equipment can not pass from one track to another unlessbogies are exchanged.
Since transloading requires handling of the goods, it causes a higher risk of damage. Therefore, transloading facilities are designed with the intent of minimizing handling. Due to differing capacities of the different modes, the facilities typically require some storage facility, such aswarehouses orrail yards. For bulk goods, specialized material handling and storage are typically provided (as, for example, ingrain elevators).Intermodal transport limits handling by using standardizedcontainers, which are handled as units and which also serve for storage if needed.
Transloading may be confused withtransshipment, but in modernusage they represent different concepts. Transloading concerns the mechanics of transport, while transshipment is essentially a legal term addressing how the shipment originates and is destined.[1] Consider a load ofgrain that is transloaded at an elevator, where it is combined with grain from other farms and thus leaves on the train as a distinct shipment from that in which it arrived. It thus cannot be said to be transshipped. Or consider a package shipped through apackage delivery service or bymail: it may change shipping mode several times along the trip, but since it is (from an external point of view) conveyed as a single shipment regardless of how it is conveyed or what else travels with it on the legs of its journey, it is not considered to be transshipped. Conversely, a load on a truck can be taken in one (legal) shipment to an intermediate point and then to its ultimate destination without ever leaving the truck. If this is specified as two shipments, then the goods are transshipped, but no transloading has taken place.
The modern distinction between transloading and transshipment was not well codified in the period of the mid-19th through mid-20th centuries, when discussions ofbreak of gauge often used the wordtransshipment for what today's careful usage would call transloading, or for any combination of transloading and transshipment.
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Transloading can occur at any place. Atruck can pull up to another truck or atrain, and transloading may be accomplished by no more elaborate means thanteamsters andstevedores. In the interests of speed and efficiency, however, a variety of specialized equipment is used to handle the goods. Thus, intermodal facilities have specializedcranes for handling thecontainers, andcoal piers havecar dumpers,loaders,conveyors, and other equipment for unloading and loadingrailroad cars andships quickly and with a minimum of personnel. Transloading facilities may also make use of a Bulk Transloading System to provide visibility of a transloading operation including rail, storage, over the road drivers, dray drivers, bookings, and the master load plan.[2]
Often the equipment used to ship the goods is optimized for rapid transfer. For instance, the shipment ofautomobiles is expedited byautorack rail cars androll-on/roll-off ships, which can be loaded without cranes or other equipment. Standardized containers allow the use of common handling equipment and obviatebreak bulk handling.
Transloading is often combined with classification and routing facilities, since the latter often require handling of goods. Transloading may occur atrailway sidings andbreak-of-gauge stations.
Where ports are too small to handle large bulk carrier ships, transloading can occur at sea, using transhipment platforms, ships, orfloating cranes and barges.[3]
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