Southern Pacific class AC-1

Infobox Locomotive
name=Southern Pacific class AC-1
powertype=Steam
railroad=Southern Pacific Railroad
gauge=4 ft 8½ in (1435 mm)
railroadclass=AC-1
driversize=57 in diameter
cylindersize=22 in dia × 30 in stroke
weight=481,200 lb
weightondrivers=440,800 lb
boilerpressure=210 psi
tractiveeffort=90,940 lbf
feedwaterheater=4¼-BL Worthington
roadnumber=4000 – 4010, 4012, 4014 – 4016
numinclass=15
retiredate=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.

References

*