| 1 | A | B | C | D | E | F |
| --- | --- | --- | --- | --- | --- | --- |
| 2 | Railpower Technologies - Green Goat Hybrid switchers |  |  |  |  |  |
| 3 | Model designation | Wheel arrangement | Build year | Total produced | Power output | Image |
| 4 | GGS2000D "Emerald" | B-B | 2001 | 1 (prototype) | 1,490 kW (2,000 hp) | - |
| 5 | GG20B "Green Goat" | B-B | 2004–current | 55 | 1,490 kW (2,000 hp) | - |
| 6 | GG10B "Green Goat" | B-B | 2005–current | 6 | 746 kW (1,000 hp) | - |
| 7 | GK10B "Green Kid" | B-B | 2005–current | 4 | 746 kW (1,000 hp) | - |

Question: What is the difference between the GG20B "Green Goat" and GG10B "Green Goat" models?
Answer: The "10" or "20" in the model designation signifies 1,000 or 2,000 horsepower (746 or 1,490 kW) respectively.