City and South London RailwayThe City and South London Railway (C&SLR) was the first successful deep-level underground "tube" railway in the world, and the first major railway to use electric traction. The railway was originally intended for cable-hauled trains, but owing to the bankruptcy of the cable contractor during construction, a system of electric traction using electric locomotives—an experimental technology at the time—was chosen instead. When opened in 1890, the line had six stations and ran for in a pair of tunnels between the City of London and Stockwell, passing under the River Thames.
Engineering toleranceEngineering tolerance is the permissible limit or limits of variation in: a physical dimension; a measured value or physical property of a material, manufactured object, system, or service; other measured values (such as temperature, humidity, etc.); in engineering and safety, a physical distance or space (tolerance), as in a truck (lorry), train or boat under a bridge as well as a train in a tunnel (see structure gauge and loading gauge); in mechanical engineering, the space between a bolt and a nut or a hole, etc.
Superliner (railcar)The Superliner is a type of bilevel intercity railroad passenger car used by Amtrak, the national rail passenger carrier in the United States. Amtrak ordered the cars to replace older single-level cars on its long-distance trains in the Western United States. The design was based on the Budd Hi-Level vehicles, employed by the Santa Fe Railway on its El Capitan trains. Pullman-Standard built 284 cars, known as Superliner I, from 1975 to 1981; Bombardier Transportation built 195, known as Superliner II, from 1991 to 1996.
Paris MétroThe Paris Métro (Métro de Paris metʁo də paʁi; short for Métropolitain metʁɔpɔlitɛ̃) and operated by the Régie autonome des transports parisiens (RATP) is a rapid transit system in the Paris metropolitan area, France. A symbol of the city, it is known for its density within the capital's territorial limits, uniform architecture and unique entrances influenced by Art Nouveau. The system is long, mostly underground. It has 308 stations of which 64 have transfers between lines.
Refrigerator carA refrigerator car (or "reefer") is a refrigerated boxcar (U.S.), a piece of railroad rolling stock designed to carry perishable freight at specific temperatures. Refrigerator cars differ from simple insulated boxcars and ventilated boxcars (commonly used for transporting fruit), neither of which are fitted with cooling apparatus. Reefers can be ice-cooled, come equipped with any one of a variety of mechanical refrigeration systems, or utilize carbon dioxide (either as dry ice, or in liquid form) as a cooling agent.
Covered goods wagonA covered goods wagon or van is a railway goods wagon which is designed for the transportation of moisture-susceptible goods and therefore fully enclosed by sides and a fixed roof. They are often referred to simply as covered wagons, and this is the term used by the International Union of Railways (UIC). Since the introduction of the international classification for goods wagons by the UIC in the 1960s a distinction has been drawn between ordinary and special covered wagons.
