Editing EMD SD90MAC (section)

==Current status==
[[File:Ns train 238 with a SD70ACU.jpg|thumb|300px|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 [[United States Environmental Protection Agency|Environmental Protection Agency]]'s Tier 2 locomotive emission regulations, although EMD had planned to be able to get the H-engine approved at some later date. However, [[People's Republic of China|China]] recently announced an order for 300 [[EMD JT56ACe|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 and Rolling Stock Company|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 shop.

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. The 265H prime mover will be cut up or exported. The only part that is not reusable is the frame. These units, in the 8900 series will be removed from storage in Denver, and will 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. These units take the original road numbers of the Union Pacific's original SD40-2 fleet.
[[File:UP_SD9043MAC_3567_on_Altoona_Sub.png|left|thumb|250px|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. Three units, the 9129, 9133 and 9138, were 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 received. 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 2021, Canadian Pacific purchased 40 more SD90MACs from the Union Pacific for further rebuilding into SD70ACU engines.

In September 2014, Norfolk Southern purchased 100 4300&nbsp;hp SD9043MACs from Union Pacific with the intent to rebuild them into [[EMD SD70ACU|SD70ACU]]s at the [[Juniata Shops]]. The last 4 SD90MACs were taken delivery by Norfolk Southern on October 3, 2015, running parallel to [[Western Avenue (Chicago)|Western Avenue]] in [[Chicago]], IL.

In 2015, [[Cummins]] rebuilt a single SD90MAC with its QSK95 engine, designed to meet [[United States emission standards|Tier 4]] emissions standards. Sygnet Rail Technologies and [[Brookville Equipment Corporation]] performed the conversion. The rebuild was designated '''HTL4200AC'''. The locomotive, numbered CECX {{Abbr|No.|Number}} 1919, had been Union Pacific {{Abbr|No.|Number}} 8559.<ref>{{cite news | url=http://trn.trains.com/news/news-wire/2015/11/10-inrd | title=Cummins Tier 4 freight locomotive headed to Indiana for testing | work=[[Trains (magazine)|Trains]] | date=November 10, 2015 | access-date=November 11, 2015}} {{subscription required}}</ref>