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Cow–calf
In rail transport, a cow–calf (also cow and calf, or in the master and slave) is a set of diesel switcher locomotives. The set is usually a pair, though a few three-unit sets (with two calves, also known as ''herds'') were built. A cow is equipped with a cab, and a calf is not. The two are coupled together (either with regular couplers or a semi-permanent drawbar) and equipped with multiple unit train control so that both locomotives can be operated from the single cab. A cow is analogous to an ''A unit'', i.e. a locomotive with a cab, and a calf to a '' B unit'', i.e. a powered, cabless road locomotive. That is, the cow and calf are each equipped with at least one prime mover for propulsion. A cow–calf set is distinct from a ''slug-and-mother'' set in that a cow and a calf are each independently powered while a ''slug'' has no prime mover and instead is dependent on power from its ''mother'' unit. Like the early EMD FT locomotives, cow–calf sets were typically b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diesel Locomotive
A diesel locomotive is a type of railway locomotive in which the prime mover (locomotive), power source is a diesel engine. Several types of diesel locomotives have been developed, differing mainly in the means by which mechanical power is conveyed to the driving wheels. The most common are diesel–electric locomotives and diesel–hydraulic. Early internal combustion engine, internal combustion locomotives and railcars used kerosene and gasoline as their fuel. Rudolf Diesel patented his first compression-ignition engine in 1898, and steady improvements to the design of diesel engines reduced their physical size and improved their power-to-weight ratios to a point where one could be mounted in a locomotive. Internal combustion engines only operate efficiently within a limited power band, and while low-power gasoline engines could be coupled to mechanical transmission (mechanics), transmissions, the more powerful diesel engines required the development of new forms of transmiss ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
