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The EMD SD90MAC is a 6,000 hp (4,470 kW)[1]C-Cdiesel-electric locomotive produced by General Motors Electro-Motive Division. It is, with the SD80MAC, one of the largest single-engined locomotives produced by EMD, surpassed only by the dual-engined DDA40X.
The SD90MAC's features include radial steering trucks with ACtraction motors and an isolated safety cab which is mounted on shock absorbers to lessen vibrations in the cab. 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.[2]
As of 2019, some SD90MACs are still in service. Norfolk Southern now rosters 110 former SD90MAC locomotives, now rebuilt as EMD SD70ACU locomotives. Canadian Pacific has also opted to convert their small fleet of long-stored SD90MACs into SD70ACUs.
History[edit]
Union Pacific SD9043MAC locomotive No. 8027
The SD90MAC was introduced in 1995, along with the SD80MAClocomotives. The SD90MAC was designed to utilize 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 6,000 horsepower (4,500 kW) engine resulted in the first locomotives being shipped with 4,300 hp (3,210 kW) 16-cylinder 710G engines, making them similar to the SD70MAC's. These locomotives were given the informal model designation SD9043MAC by railroads that purchased them with the option to re-engine them with 6,000 hp (4,470 kW) engines when they became available.[3] This upgrade program, however, was never taken advantage of by SD90MAC buyers due to reliability issues with the newer engine. Over 400 SD90MAC locomotives fitted with the 4,300 hp (3,210 kW) 710 engine were built.
In 1996, Electro-Motive Diesel entered full production on their 6,000 hp (4,470 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-Hlocomotives. Later versions of the SD90MAC-H feature a Phase II cab, with a new nose which offers higher visibility from the cab than the old nose. The SD90MAC-H did not prove popular with railroads and less than 70 were built, including Electro-Motive Diesel 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.[3] The Canadian Pacificlocomotives were part of an earlier order for 710-engine equipped SD90MAC locomotives that was still in production when Electro-Motive Diesel switched over to the H-engine.
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Electro-Motive Diesel also tried offering a lower-power version of the SD90MAC with a 12-cylinder engine called the SD89MAC, but none were produced other than the prototype. https://mhdkxkn.weebly.com/blog/hisuite-for-mac.
Specifications[edit]
Prime mover (EMD 710):
Prime mover (EMD 265):
Traction motors:
Performance (parenthesis indicate H-Engine equipped specifications):
Fleet rosters[edit]
CP 9112 being transported south on the CP Emerson Subdivision, to be converted to an SD70ACU.
CEFX
Union Pacific:
![]() Current status[edit]
Norfolk Southern Railway SD70ACU No. 7305. The SD70ACU is part of Norfolk Southern's SD90MAC rebuild program.
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, China recently announced an order for 300 JT56ACe locomotives, which also use the H-Engine as its prime mover. A portion of the locomotives will be assembled in kit form by China's own Dalian Locomotive Works. These units were reportedly capable of meeting the EPA's strict regulations and began delivery in the latter half of 2007.
Due to reliability issues, FMG units 910 to 917 are stored and deemed not be used. They were purchased to be used as 'slave' units, and they were more offline than they were in use. FMG is looking to fit 910-917 to the same specifications as 901-909. 916 is currently in the shops.
On 1 August, 2008 Union Pacific Railroad announced that it would be retiring 21 of the SD90MAC locomotives. Common parts will be used to maintain the railroad's 710-engined SD90MAC fleet.[8] The 265H prime mover will be cut up or exported. The only part that is non-reusable will be the frame. These units, in the 8900 series will be removed from storage in Denver, and be sent to East St. Louis, Ill., in small batches to be dismantled. As of 2019, Union Pacific still operates some of the remaining SD9043MACs, which sport new numbers and UP wings on the cab. Keypass for mac.
UP 3567, an SD9043MAC still in regular service in 2019
Canadian Pacific's SD90MAC-H locomotives 9300-9303 (listed as SD90MAC6000s) were up for tendered sale in 2009. The bidding ended 31 March, 2010. While they were originally thought to be shipped overseas, they were eventually moved to Quebec for scrapping.
Canadian Pacific's SD90MAC locomotives, numbered in the 9100-9160 series had been in long term storage in Winnipeg, Manitoba for much of the 2010-decade. With three units, the 9129, 9133 and 9138 being scrapped in November 2012 due to errors in preparing them for long term storage. The entire fleet had been put up for sale in November 2012 and again in January 2013 with no offers being made. These units remained stored until the Winter of 2018 when at first 30, then all 58 remaining units entered a rebuild program to be converted into SD70ACUs.
In September 2014, Norfolk Southern purchased 100 4300 hp SD9043MACs from Union Pacific with the intent to rebuild them into SD70ACUs at the Juniata Shops. Games like maplestory for mac. The last 4 SD90MACs were taken delivery to Norfolk Southern on October 3, 2015 running parallel to Western Ave in Chicago IL.
On 26 June, 2018 it was announced that CP had contacted Progress Rail (corporate parent to EMD) to rebuild 30 of their SD90MAC fleet into SD70ACUs, much like the Norfolk Southern had previously done with a second-hand SD90MAC fleet. In 2019, an additional 30 units were added to the order for a total of 60 SD70ACU rebuilds, with 28 coming from the remainder of Canadian Pacific's SD90MAC fleet and the other two purchased from Union Pacific's SD90MAC fleet.
In 2015 Cummins rebuilt a single SD90MAC with its QSK95 engine, designed to meet Tier 4 emissions standards. Sygnet Rail Technologies and Brookville Equipment Corporation performed the conversion. The rebuild was designated HTL4200AC. The locomotive, numbered CECX No. 1919, had been Union Pacific No. 8559.[9]
See also[edit]
References[edit]Mak 90 For Sale Rifles
Mak 90 For Sale Used
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