SP MC-4 Class Cab Forward No. 4018.
(Richard Janosko, Pinterest, Fair use, Title 17, Section 107)
SP CLASS MC-4 CAB FORWARD 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 "simpled" to use uniform size cylinders and feedwater heaters were installed to 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.
SP MC-4 Class Cab Forward No. 4024.
(Richard Janosko, Pinterest, Fair use, Title 17, Section 107)
Overview
Type and origin
Power type: Steam
Builder: Baldwin Locomotive Works
Serial numbers: 36490-36493, 36524-36527, 36614-36616, 36634
Build dates: April–May 1911
Specifications
Configuration:
• Whyte 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)
Locomotive 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)
Career
Operators: Southern Pacific Railroad
Class: MC-4
Road Numbers: 4017 – 4028
First run: July 21, 1911
Retired: 1947 – 1948
Disposition: scrapped
SP MC-4 Class Cab Forward No. 4028.
(Internet Photo, Pinterest, Fair use, Title 17, Section 107)
