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Southern Pacific Class MC-4 Mallet Consolidation Cab Forward Steam Locomotive
Southern Pacific Railroad's MC-4 class of steam locomotive was the second class ordered and built as cab forward locomotives. Southern Pacific (SP) found the MC-2 class sufficient for a proof-of-concept for cab forward locomotives and sought to continue with now tested designs.

In service, SP found that the locomotives were a little too slow for the traffic needs. By 1930, all of the MC-4 class had been modified from compound to simple using uniform size cylinders, and feedwater heaters were also installed to help address the issue. They were then reclassified as AC-2 locomotives. As rebuilt, the locomotives continued in service through the end of World War II.

Southern Pacific Class MC-4 Overview
Type and origin
Power type: Steam
Builder: Baldwin Locomotive Works
Serial number: 36490-36493, 36524-36527, 36614-36616, 36634
Build date: April–May 1911
Configuration: 2-8-8-2
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Driver diameter: 57 in (1,448 mm)
Adhesive weight: 398,500 lb (180,800 kg)
Loco weight: 432,600 lb (196,200 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: 85,040 lbf (378.28 kN)

Operator: Southern Pacific Railroad
Class: MC-4
Numbers: 4017 – 4028
First run: July 21, 1911
Retired: 1947 – 1948
Disposition: scrapped

See also:

Cab Forward Locomotives

Southern Pacific

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SP Cab Forward No. 4017.
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SP cab forward No. 4017.

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