| Southern Pacific class AC-6 | |
|---|---|
| Power type | Steam |
| Builder | Baldwin Locomotive Works |
| Serial number | 61353, 61354, 61382-61389, 61416, 61426-61429, 61491-61494, 61535-61538, 61543, 61544 |
| Build date | May-December 1930 |
| Configuration | 4-8-8-2 |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Driver diameter | 63 in (1,600 mm) |
| Weight on drivers | 517,000 lb (235 t) |
| Locomotive weight | 639,500 lb (290.1 t) |
| Boiler pressure | 250 psi (1.7 MPa) |
| Feedwater heater | 6S Worthington |
| Cylinder size | 24 × 34 in (610 × 860 mm) (bore × stroke) |
| Tractive effort | 124,300 lbf (553 kN) |
| Career | Southern Pacific Railroad |
| Class | AC-6 |
| Number in class | 25 |
| Number | 4126 – 4150 |
| First run | July 10, 1930 |
| Retired | 1953 – 1955 |
| Disposition | scrapped |
Southern Pacific Railroad's AC-6 class of steam locomotives was the third of the railroad's classes built with a 4-8-8-2 wheel arrangement. Like the earlier AC-4 and AC-5 classes, the AC-6 class were cab forward locomotives. The AC-6 was slightly larger than the previous classes with a higher boiler pressure and tractive effort rating.
In 1947 and 1948 this class was rebuilt with cast steel frames, increasing the overall weight to 648,000 lb (with 523,600 lb on the drivers). At this time most of the locomotives in the class were also equipped with larger cab windows that became standard for SP's cab forward locomotives beginning with the AC-8 class.
This class was removed from active service between 1954 and 1955 and they were all scraped by March 1956.
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