Classic Streamliners - TRAIN​CYCLOPEDIA

Southern Pacific Class MC-1 Mallet Consolidation Steam Locomotive
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.

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, modified the locomotive from compound to simple with uniform cylinders and reclassified it as an AC-1. No. 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, modified on February 9, 1931, retired from active service on May 23, 1947 and scrapped on June 14, 1947, at SP's Sacramento shops.

Southern Pacific Class MC-1 Overview

Type and origin
Power type: Steam
Builder: Baldwin Locomotive Works
Serial numbers: 33340, 33341
Build date: April 1909
Configuration: 2-8-8-2
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Driver diameter: 57 in (1.448 m)
Adhesive weight: 394,150 lb (178,780 kg)
Locomotive 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)
Operator: Southern Pacific Railroad
Clas:s MC-1
Number in class: 2
Numbers: 4000, 4001
First run: May 26, 1909
Retired: 1948
Disposition: scrapped

See also:

Cab Forward Locomotives

SP MC-2 Class Locomotive

2-8-8-2 Locomotives

Steam Locomotives


Related Products

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SP No. 4000, prior to conversion to cab forward.

No. 4000 after rebuild.

Historic Rail - Shop Now!

SP 4000 shown prior to rebuild into a cab forward locomotive, ca. 1909.

SP Cab Forward Collection DVD
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