The EMD SD90MAC is a 6000 horsepower (4.5 KW) C-C diesel-electric locomotive produced by General Motors Electro-Motive Division. It is, with the SD80MAC, one of the largest single-engined locomotive produced by that company, surpassed only by the dual-engined DD series. The SD90MACs feature radial steering trucks and an isolated cab which was mounted on shock absorbers to lessen vibrations in the cab. All SD90MACs use AC traction motor technology. They are all hood units fitted with safety cabs. The SD90MAC, like the SD80MAC, SD70ACe, and SD70M-2, has a wide radiator section, nearly the entire width of the locomotive, which along with their size makes them easy to spot. Image File history File links Download high-resolution version (1024x768, 241 KB) Author: Chris Keating (=Schnauf) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): EMD SD90MAC ... The Union Pacific Railroad (AAR reporting mark UP) (NYSE: UNP) is the largest railroad in the United States. ... Electro-Motive Diesels, Inc. ... The AAR wheel arrangement system is a method of classifying locomotive (or unit) wheel arrangements that was developed by the Association of American Railroads. ... Rail gauge is the distance between the inner sides of the two parallel rails that make up a railway track. ... A foot (plural: feet) is any of several old units of distance or length, measuring around a quarter to a third of a meter. ... Mid-19th century tool for converting between different standards of the inch An inch is an Imperial and U.S. customary unit of length. ... A millimetre (American spelling: millimeter, symbol mm) is an SI unit of length that is equal to one thousandth of a metre. ... A piston and cylinder from a steam engine A cylinder in an internal combustion engine is the space within which a piston travels. ... The horsepower (hp) is the name of several non-metric units of power. ... The horsepower (hp) is the name of several non-metric units of power. ... The AAR wheel arrangement system is a method of classifying locomotive (or unit) wheel arrangements that was developed by the Association of American Railroads. ... A number of vehicles use a diesel-electric powerplant for providing locomotion. ... Electro-Motive Diesel, Inc. ... The SD80MAC is a 5000 horsepower (3. ... A print advertisement for General Motors locomotives from the October 6, 1941 issue of Life Magazine. ... Traction motor typically refers to those motors that are used to power the driving wheels of a railroad locomotive, electrical multi-unit train (such as a subway or light rail vehicle train), or a tram. ... A GP40 running long hood forward A hood unit, in railroad terminology, is a body style for locomotives. ...
History
The SD90MAC was introduced in 1995, along with the SD80MAC locomotives. The SD90MAC was designed to utilized the new 16-cylinder "H-engine," while the SD80MAC was designed to use the 20 cylinder version of the existing 710G engine. However, technical problems with the 6000 horsepower engine resulted in the first locomotives being shipped with 4300 horsepower (3.2 KW) 16-cylinder 710G motors, making them similar to the SD70MACs. These locomotives were given the model SD90/43MAC and railroads were given the option to remotor them with 6000 horsepower (4.5 KW) engines when they became available. This upgrade program was rarely used due to reliability issues with the newer engine. Over 400 SD90/43MAC locomotives were built. 1995 (MCMXCV) was a common year starting on Sunday of the Gregorian calendar. ... The SD80MAC is a 5000 horsepower (3. ... This article or section is in need of attention from an expert on the subject. ... The EMD SD70 is a series of diesel-electric locomotives produced by General Motors Electro-Motive Division from 1992 to the present. ...
In 1996, EMD entered full production on their 6000 horsepower (4.5 KW), 16-cylinder H-engine, and all SD90MACs made from then on used that for its prime mover. Locomotives fitted with this engine are sometimes referred to as SD90MAC-H locomotives. Later versions of the SD90MAC-H feature a new nose which offers higher visibility from the cab than the old nose, although many railfans have complained about the look of the sharp edges on it. The SD90MAC-H did not prove popular with railroads and less than 70 were built, including EMD demonstrator units. Since the SD90MAC-H had such a large prime mover, it didn't offer the same operational flexibility as smaller units, limiting its possible customer base to only the largest railroads. Also, since the H-engine was a new design it hadn't reached the same level of reliability as EMD's previous engine. The low reliability on such a large engine was an especially bad combination since the loss of one engine in a train meant the loss of a larger percentage of pulling power than had a smaller engine failed. In the end the SD90MAC-H was only delivered to two railroads, the Union Pacific Railroad and the Canadian Pacific Railway. The Canadian Pacific locomotives were part of an earlier order for SD90/43MAC locomotives that was still in production when EMD switched over to the H-engine. 1996 (MCMXCVI) was a leap year starting on Monday of the Gregorian calendar, and was designated the International Year for the Eradication of Poverty. ... For the philosophical/theological concept of a prime mover (that is, a self-existent being that is the ultimate cause or mover of all things), see cosmological argument. ... The Union Pacific Railroad (AAR reporting mark UP) (NYSE: UNP) is the largest railroad in the United States. ... The Canadian Pacific Railway (CPR; AAR reporting marks CP, CPAA, CPI), known as CP Rail between 1968 and 1996, is a Canadian Class I railway operated by Canadian Pacific Railway Limited. ...
EMD also tried offering a lower-power version of the SD90MAC with a 12-cylinder engine called the SD89MAC, but none was produced other than the prototype.
As of January 2005, the SD90MAC is no longer in production due to the Environmental Protection Agency's Tier 2 locomotive emission regulations, although EMD may be able to get the H-engine approved at some later date. However, the People's Republic of China recently announced an order for 300 JT56ACe locomotives, a portion of which will be assembled in kit form by China's own Dalian Locomotive Works. These units will reportedly be capable of meeting the EPA's strict regulations and will begin delivery in the latter half of 2007. EPA redirects here. ...
January 13 is the 13th day of the year in the Gregorian calendar. ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ... January 13 is the 13th day of the year in the Gregorian calendar. ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ...
SD90MAC is the most powerful modern locomotive from EMD, with its 6 axle C-C bogies and a new "H" diesel, making 6000 h.p., it leaves behind traditional EMD engine designs.
EMD tried to attract attention to it, making two demonstrators in 1998, but they didn't help, as the SD90MAC family ended production in 2000.
Now EMD is concentrating on the SD70 family, that are much more popular, and more importantly can compete with the GE hit, Dash 9-44CW and its AC4400CW brother.
The EMDDD35 was a 5,000 hp (3,700 kW) diesel-electriclocomotive of D-D wheel arrangement built by General Motors' Electro-Motive Division for the Union Pacific Railroad and Southern Pacific Railroad.
EMD produced a demonstrator set like this in September 1963, painted in striking red and white (similar to the Frisco's livery).
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