| Great Northern 400 |
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GN 400 after arriving in Duluth, June 7, 2019. |
| Type and origin |
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| Power type | Diesel |
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| Builder | Electro-Motive Division |
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| Serial number | 31598 |
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| Model | SD45 |
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| Build date | 1966 |
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| Performance figures |
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| Power output | 3,600 horsepower (2,700 kW) |
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| Career |
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| Operators | |
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| Numbers | |
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| Nicknames | Hustle Muscle |
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| Locale | Duluth, Minnesota, United States |
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| Delivered | May 1966 |
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| Retired | 1986 |
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| Restored | 1989, 2007, 2019 |
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| Current owner | Great Northern Railway Historical Society |
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| Disposition | In service |
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| On operational lease to the Lake Superior Railroad Museum. |
Great Northern 400, nicknamed Hustle Muscle, is a restored SD45 diesel locomotive originally owned by the Great Northern (GN). It was built in 1966 as the first production SD45 by Electro-Motive Division.