EMD GP20D

{{Infobox locomotive

| name = EMD GP20D

| powertype = Diesel-electric

| image = Blue_Engines,_Market_Street,_Houston,_Texas_0403091059.jpg

| caption = Two EMD GP20D's in the CEFX scheme. Note that both hoods are lowered.

| gauge = {{track gauge|ussg|allk=on}}

| aarwheels = B-B

| builder = MotivePower & Electro-Motive Diesel

| builddate = June 2000 – August 2001

| buildmodel = GP20D

| maxspeed = {{convert|70|mph|0|abbr=on}}{{cite web|url =http://www.emdiesels.com/en/locomotive/switcher/gp20d/ |title =GP20D| access-date = 2008-08-13 |url-status=dead |archive-url=https://web.archive.org/web/20060314005357/http://www.emdiesels.com/en/locomotive/switcher/gp20d/ |archive-date=March 14, 2006}}

| locobrakes = Dynamic

| cylindercount = 16

| primemover = EMD Caterpillar 3516
(EMD 16-170B20-T2){{cite web|url=http://www.emdiesels.com/en/locomotive/switcher/gp20d/features.htm |title=EMD: GP20D Features |access-date=2008-08-13 |url-status=dead |archive-url=https://web.archive.org/web/20060314011542/http://www.emdiesels.com/en/locomotive/switcher/gp20d/features.htm |archive-date=March 14, 2006 }}{{cite news| url=http://findarticles.com/p/articles/mi_m1215/is_9_203/ai_92284635/ | work=Railway Age | title=Sipping, not slurping: how much fuel efficiency can be squeezed out of a locomotive? Railroads and suppliers have devised innovative ways to reach what has been an elusive goal | first=William C. | last=Vantuono | year=2002 |url-status=dead |archive-url=https://web.archive.org/web/20070221075636/https://www.findarticles.com/p/articles/mi_m1215/is_9_203/ai_92284635 |archive-date=February 21, 2007 }}

| tractiveeffort = {{convert|65000|lbf|kN|abbr=on}} continuous
{{convert|97000|lbf|kN|abbr=on}} starting
{{convert|38000|lbf|kN|abbr=on}} braking

| fuelcap = {{convert|2550|usgal|abbr=on}}

| enginetype = Four-stroke V16 fuel injected diesel

| aspiration = Turbocharged

| poweroutput = {{convert|2000|hp|abbr=on|sigfig=3}}

| totalproduction = 40

}}

The GP20D is a four-axle B-B switcher locomotive built by MotivePower and Electro-Motive Diesel. It was supplied with a Caterpillar 3516 (called a 16-170B20-T2 by EMD) V16 prime mover which develops a total power output of {{convert|2000|hp|lk=in|sigfig=3}}. To date, only 40 units have been produced by EMD, all of which were manufactured during June 2000. The GP20D is also a hood unit with lowered long and short hoods based on MotivePower's earlier MP2000D locomotives. The changes between the MK2000D and the GP20D are primarily in the control electronics, making them easier to use than the older model.

Although the GP20D is marketed as a switcher, it has a top speed of {{convert|70|mph|0|abbr=on}}, and is usually fitted with dynamic brakes, making it suitable for road switcher duties as well. The similar appearing EMD GP15D does not have dynamic brakes and has a lower horsepower rating (1500 vs 2000).