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A Diesel locomotive is a type of Railroad Locomotive in which the Prime Mover (main power source) is a Diesel Engine . Several types of Diesel locomotive have been developed, the principal distinction being in the means by which the Prime Mover 's mechanical power is conveyed to the driving wheels (drivers). OVERVIEW Early Internal Combustion Engine -powered Locomotive s used Gasoline as their fuel. Soon after Dr. Rudolf Diesel patented his first compression ignition engine in 1892Diesel, Rudolf. U.S. Patent No. 608,845, filed July 15, 1895, and issued August 9, 1898 ::''Accessed via Google Patent Search at: US Patent #608,845 on February 8, 2007.'', its application for railway propulsion was considered. Progress was slow, however, due to the poor power-to-weight ratio of the early engines, as well as the difficulty inherent in mechanically applying power to multiple driving wheels on swivelling trucks (bogies). Steady improvements in the Diesel engine's design (many developed by Sulzer Ltd. of Switzerland , with whom Dr. Diesel was associated for a time) gradually reduced its physical size and improved its power-to-weight ratio to a point where one could be mounted in a locomotive. Once the concept of Diesel-electric drive was accepted the pace of development quickened. By the mid 20th century the Diesel Locomotive had become the dominant type of Locomotive in much of the world, offering greater flexibility and performance than the Steam Locomotive , as well as substantially lower operating and maintenance costs. Currently, almost all Diesel Locomotive s are Diesel-electric. HISTORY Adaptation of the Diesel engine for rail use | |||||||||||||||||||||
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