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 type Steam Builder Baldwin Locomotive Works Serial number 33340, 33341 Build date April 1909
Specifications Configuration: ​  • Whyte 2-8-8-2 Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Driver dia. 57 in (1.448 m) Adhesive weight 394,150 lb (178,780 kg) Loco weight 425,900 lb (193,200 kg) Boiler pressure 200 psi (1.4 MPa) High-pressure cylinder 26 in × 30 in (660 mm × 762 mm) Low-pressure cylinder 40 in × 30 in (1,016 mm × 762 mm)
Performance figures Tractive effort 94,880 lbf (422.0 kN)
Career Operators Southern Pacific Railroad Class MC-1 Number in class 2 Numbers 4000, 4001 First run May 26, 1909 Retired 1948 Disposition scrapped

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.