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EMD SD40-2
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=== SD40N === Union Pacific has rebuilt 486 of their SD40-2's into SD40N's at their Jenk's shop. These units received a microprocessor control system to increase adhesion, control options, and extend the life of the locomotive.<ref>{{Cite web |last=Craig |first=R |title=Union Pacific Motive Power |url=https://www.thedieselshop.us/UP.HTML |url-status=live |archive-url=https://web.archive.org/web/20231228223440/https://www.thedieselshop.us/UP.HTML |archive-date=28 December 2023 |access-date=2024-03-15 |website=The Diesel Shop}}</ref><ref>{{Cite web |title=Union Pacific Locomotive Roster |url=https://www.up.com/aboutup/funstuff/locomotive-roster/index.htm |url-status=live |archive-url=https://web.archive.org/web/20240104211824/https://www.up.com/aboutup/funstuff/locomotive-roster/index.htm |archive-date=4 January 2024 |access-date=15 March 2024 |website=Up.com}}</ref>
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