Southern Pacific class MC-1

Southern Pacific Railroad's MC-1 class of steam locomotive consisted of two locomotives built by Baldwin Locomotive Works in April 1909. They are the first two locomotives converted by Southern Pacific (SP) to run as cab forward locomotives.

Southern Pacific class MC-1
Number 4000 before it was converted to a cab forward locomotive.
Type and origin
Power typeSteam
BuilderBaldwin Locomotive Works
Serial number33340, 33341
Build dateApril 1909
Gauge4 ft 8 12 in (1,435 mm) standard gauge
Driver dia.57 in (1.448 m)
Adhesive weight394,150 lb (178,780 kg)
Loco weight425,900 lb (193,200 kg)
Boiler pressure200 psi (1.4 MPa)
High-pressure cylinder26 in × 30 in (660 mm × 762 mm)
Low-pressure cylinder40 in × 30 in (1,016 mm × 762 mm)
Performance figures
Tractive effort94,880 lbf (422.0 kN)
OperatorsSouthern Pacific Railroad
Number in class2
Numbers4000, 4001
First runMay 26, 1909

The first of these two, number 4000, entered service on May 26, 1909. It was rebuilt as a cab forward and reclassified as an MC-2 in June 1923. Another rebuild on June 4, 1931, "simpled" it with uniform cylinders and reclassified it as an AC-1. 4000 was scrapped on April 2, 1948. The second locomotive in this class, 4001, entered service on May 30, 1909. It was rebuilt as an MC-2 in April 1923, "simpled" on February 9, 1931, retired from active service on May 23, 1947 and scrapped on June 14, 1947, at SP's Sacramento shops.


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