Shipping and Transport in the context of facilitation of international trade deals with the organization, preparation, documentation, execution and reporting of the international movement of goods and conveyances. There are various reasons for moving goods, such as the purchase of products, supply of stocks for a production process, stocking shops, the replenishment of warehouses and distribution centres, or the movement of parts to a building site. Physical transport may be by road, rail, sea, air, inland waterways or pipelines and other fixed installations such as cable for the transport of electricity. The movement of goods can involve several modes of transport, for example pre-carriage to a seaport by a truck, main carriage to another continent by an ocean-going vessel, and on-carriage by rail.