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The GP20D is a four-axle B-B switcher built by MotivePower Industries and General Motors Electro-Motive Division. The GP20D is a hood unit with lowered long and short hoods based on MotivePower Industries' 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 70 MPH, and is usually fitted with dynamic brakes, making it suitable for road switcher duties as well.
| Diesel locomotives built by GM-EMD | | Switchers: | SC, NC, NC1, NC2, T, NW2, NW3, NW4, NW5, TR1, SW1, SW7, SW8, SW9, SW600, SW900, SW1000, SW1001, SW1200, SW1500, SW1504, MP15DC, MP15AC, MP15T, GMD1, RS1325 | | Four axle road power: | BL2, GP7, GP9, GP15-1, GP15AC, GP15T, GP18, GP20, GP20D, GP28, GP30, GP35, GP38, GP38AC, GP38-2, GP39, GP39DC, GP39X, GP39-2, GP40, GP40P, GP40P-2, GP40TC, GP40X, GP40-2, GP49, GP50, GP59, GP60, GP60B, GP60M | | Six axle road power: | SD7, SD9, SD18, SD24, SD28, SD35, SDP35, SD38, SD38AC, SD38-2, SD39, SDL39, SD40, SD40A, SD40-2, SD40-2W, SD40T-2, SD402-SS, SDP40, SD45, SD45X, SD45-2, SD45T-2, SDP45, SD50, SD50F, SD50S, SD60, SD60F, SD60M, SD60MAC, SD70, SD70ACe, SD70M, SD70M-2, SD70MAC, SD80MAC, SD90MAC | | Eight axle road power: | DD35, DD35A, DDA40X | | Cab units (F- & E-units) | FT, F2, F3, F7, FP7, F9, FP9, FL9, TA, EA/EB, E1, E2, E3, E4, E5, E6, E7, E8, E9, AB6 | | Cowl units: | F45, FP45, F40C, F40PH, F40PH-2, F40PH-2C, F40PH-2M, SDP40F, SD40-2F, SD50F, F59PH, F59PHI, SD60F | | Electrics: | SW1200MG, AEM7, GM6, GM10, GF6C | | Industrial, military, export and narrow gauge: | Model 40, DHI, GMDH-1, GMDH-3, MRS-1, GA8, G8, G12, G16, NF210 | | Streamliners: | M-10000, M-10001, M-10002, M-10003-6, Pioneer Zephyr, General Pershing Zephyr, Green Diamond, Flying Yankee | | Experimentals: | EMD 1800 hp B-B | |
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