GE Dash 8-40C

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C40-8
UP 9214, a C40-8, leads an eastbound train up California's Cajon Pass on May 10, 1991.
Type and origin Power type Diesel-electric Builder GE Transportation Systems Model C40-8 Build date 1987–1992 Total produced 585
Specifications Configuration: ​  • AAR C-C Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge 5 ft 3 in (1,600 mm), Brazil Length 70 ft 8 in (21.54 m) Width 10 ft 3.5 in (3.14 m) Height 15 ft 4.5 in (4.69 m) Loco weight 391,600 lb (177,600 kg) Prime mover GE FDL
Career Operators Various Locale North America, Brazil Disposition nearly all have been retired as of 2022

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.