| C40-8 | 
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| | Specifications | 
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 | Configuration: 
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 | • AAR | C-C | 
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 | Gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge 5 ft 3 in (1,600 mm), Brazil
 | 
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 | Length | 70 ft 8 in (21.54 m) | 
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 | Width | 10 ft 3.5 in (3.14 m) | 
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 | Height | 15 ft 4.5 in (4.69 m) | 
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 | Loco weight | 391,600 lb (177,600 kg) | 
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 | Fuel capacity | 5,000 US gal (4,200 imp gal; 19,000 L) | 
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 | Prime mover | GE 7FDL-16 | 
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 | 
| | Career | 
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 | Operators | Various | 
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 | Locale | North America, Brazil | 
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 | Disposition | nearly all have been retired as of 2022 | 
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The GE C40-8 is a model of 6-axle diesel-electric locomotive built by GE Transportation Systems between 1987 and 1992. It is part of the GE Dash 8 Series of freight locomotives, and its wheel arrangement is of a C-C type.
This locomotive model is often referred to as a Dash 8-40C or simply "Dash 8". "Dash 8" in general refers to the electrical control series, "Dash" being a carryover from the older syntax of C40-8. The "40" refers to the baseline horsepower rating (4,000 hp or 3,000 kW) of the unit, although some units may be re-rated to 4,100 hp (3,100 kW).
Later units were supplied with a wide-nose cab and are designated Dash 8-40CW, the "W" indicating a wide-nose cab.