Editing EMD SD40-2 (section)

{{Short description|North American diesel–electric locomotive class}}
{{Infobox locomotive
| name = EMD SD40-2
| powertype = [[Diesel–electric]]
| image = MRL 250.jpg
| alt = 
| caption = [[Montana Rail Link]] XDM SD40-2 diesel locomotive 250 at [[Everett, Washington]], United States, January 1994
| builder = [[General Motors Corporation|GM]] [[Electro-Motive Diesel|Electro-Motive Division]] (EMD)<br>[[General Motors Diesel]] (GMD)<br>[[MACOSA|Material y Construcciones S.A.]] (MACOSA)<br />[[Equipamentos Villares S.A.]] (EVSA)
| gauge = {{track gauge|ussg|allk=on}}<br>{{track gauge|5ft3in|lk=on}}, Brazil<br>{{track gauge|1000mm|allk=on}}, Guinea and Brazil
| serialnumber = 
| buildmodel = SD40-2
| builddate = January 1972 – October 1989
| totalproduction = 4,029
| aarwheels = C-C
| uicclass = Co′Co′
| Britishclass = Co-Co
| driverdiameter = {{convert|40|in|mm|0|abbr=on}}
| wheelbase = {{convert|43|ft|6|in|abbr=on}} between [[Truck bolster|bolsters]]; {{convert|13|ft|7|in|abbr=on}} between axles in each [[Bogie|truck]]
| length = {{convert|68|ft|10|in|abbr=on}} over the [[Janney coupler|coupler]] pulling faces
| width = {{convert|10|ft|3+1/8|in|2|abbr=on}} over the [[grabiron]]s
| height = {{convert|15|ft|7+1/8|in|2|abbr=on}}
| locoweight = {{convert|368000|lb|kg|abbr=in|disp=br()}}<br>or {{convert|184|ST|LT t|abbr=on|disp=br()}}
| fueltype = Diesel
| fuelcap = {{convert|3200|-|4000|usgal|disp=br()|abbr=on}}
| primemover = [[Electro-Motive Diesel|EMD]] [[EMD 645|16-645E3]]
| enginetype = [[V16 engine|V16]] [[diesel engine]]
| aspiration = [[Turbocharger|turbocharged]]
| cylindercount = 16
| poweroutput = {{convert|3000|hp|abbr=on|lk=in|sigfig=3}}
| maxspeed = {{convert|65|mph|kph|abbr=on}}
| tractiveeffort = '''Starting:''' {{convert|115000|lbf|kgf|0|abbr=on}} at 31.5%<br />'''Continuous:''' {{convert|82100|lbf|kgf|0|abbr=on}} at {{convert|11|mph|kph|0|abbr=on}}
| operator = Various
| locale = [[North America]], [[Brazil]], [[Guinea]], Mauritania
}}

The '''EMD SD40-2''' is a {{convert|3000|hp|adj=on}} [[AAR wheel arrangement#C-C|C-C]] [[diesel–electric locomotive]] built by [[Electro-Motive Diesel|EMD]] from 1972 to 1989.

The SD40-2 was introduced in January 1972 as part of EMD's ''[[EMD Dash 2|Dash 2]]'' series, competing against the [[GE U30C]]. Although higher-horsepower locomotives were available, including EMD's own [[EMD SD45-2|SD45-2]], the reliability and versatility of the {{convert|3,000|hp|adj=on}} SD40-2 made it one of the best-selling models in EMD's history, edged out only by the [[EMD GP9|GP9]], and was the standard of the industry for several decades after its introduction. The SD40-2 was an improvement over the [[EMD SD40|SD40]], with modular electronic control systems similar to those of the experimental [[DDA40X]].

Peak production of the SD40-2 was in the mid-1970s. Sales of the SD40-2 began to diminish after 1981 due to the oil crisis, increased competition from [[GE Dash 7 Series|GE's Dash-7]] series and the introduction of the [[EMD SD50]], which was available concurrently to late SD40-2 production. The last SD40-2 delivered to a United States railroad was built in July 1984, with production continuing for railroads in Canada until 1988, Mexico until February 1986, and Brazil until October 1989. A total of 4029 units were produced.

To suit export country specifications, General Motors designed a number of SD40 variants, including the JT26CW-SS ([[British Rail Class 59]]) for Great Britain, the [[GT26CW-2]] for Yugoslavia, South Korea, Iran, Morocco, Peru and Pakistan, the [[GT26CU-2]] for to Zimbabwe and Brazil, and the [[GT26HCW-2]] for Algeria.