Southern Pacific class AC-1

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Southern Pacific class AC-1

Power type	Steam
Gauge	4 ft 8½ in (1435 mm)
Driver size	57 in diameter
Weight on drivers	440,800 lb
Total weight	481,200 lb
Boiler pressure	210 psi
Feedwater heater	4¼-BL Worthington
Cylinder size	22 in dia × 30 in stroke
Tractive effort	90,940 lbf
Career	Southern Pacific Railroad
Class	AC-1
Number in class	15
Number	4000 – 4010, 4012, 4014 – 4016
Retired	1947 – 1948
Disposition	scrapped

Southern Pacific Railroad's AC-1 class of cab forward steam locomotives consisted of locomotives rebuilt from MC-1 and MC-2 class locomotives that were originally built by Baldwin Locomotive Works in 1909. The MC-2 class was the first class of locomotives built and delivered to SP as cab forward locomotives. The AC-1 class was the first of the successful AC series of cab forward locomotives that numbered nearly 200 in total on the SP.

Their rebuilds into class AC-1 occurred around 1930; SP used the rebuilt locomotives through the traffic rush of World War II, then removed them from the roster soon after the war. They were all retired from active service by 1949 and were scrapped soon after their retirement. The last locomotive of this class that was scrapped was number 4014 on April 12, 1949.

[edit] References

• Diebert, Timothy S. and Strapac, Joseph A. (1987). Southern Pacific Company Steam Locomotive Conpendium. Shade Tree Books. ISBN 0-930742-12-5. 

v • d • e Cab forward steam locomotives of Southern Pacific Railroad
2-6-6-2:	MM-2 (rebuilt as 4-6-6-2)
2-8-8-2:	MC-1 · MC-2 · AC-1 · MC-4 · AC-2 · MC-6 · AC-3
4-8-8-2:	AC-4 · AC-5 · AC-6 · AC-7 · AC-8 · AC-10 · AC-11 · AC-12
Preserved:	SP 4294 (AC-12)