Southern Pacific class MC-2

Southern Pacific class MC-2
Number 4014 in 1910.
Type and origin
Power typeSteam
BuilderBaldwin Locomotive Works
Serial number34019, 34043, 34044, 34046, 34047, 34063-34067, 34093-34097
Build dateNovember–December 1909
Specifications
Configuration:
​
 • Whyte2-8-8-2
Gauge4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.57 in (1,448 mm)
Adhesive weight394,700 lb (179,000 kg)
Loco weight437,000 lb (198,000 kg)
Fuel typeoil
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 (422.05 kN)
Career
OperatorsSouthern Pacific Railroad
ClassMC-2
Number in class15
Numbers4002 – 4016
First runFebruary 4, 1910
Retired1946 – 1948
Dispositionscrapped

Southern Pacific Railroad's MC-2 class of steam locomotives was the first class to be ordered by and built for Southern Pacific (SP) as cab forward locomotives. They were built in 1909 following the design of SP's MC-1 class built earlier that year. The success of this locomotive model led to the design and introduction of the AC class of 4-8-8-2 cab forward locomotives in the 1930s and 1940s.

In order to get the fuel oil from the tender to the opposite end of the locomotive where the firebox sat, SP had to pressurize the oil in the tender. Five pounds-force per square inch (34 kPa) of air pressure was sufficient to get the oil to the fire.

The two MC-1 locomotives built in May 1909 were rebuilt in 1923 as MC-2 class with uniform cylinders measuring 22 in (559 mm) diameter × 30 in (762 mm) stroke; these rebuilt locomotives weighed 437,000 lb (198,000 kg), like the as-built MC-2 class, but with 393,700 lb (178,600 kg) on the drivers. Most of the rest of the MC-2 class were "simpled" to the same size cylinders by 1931. Except for numbers 4011 and 4013 which were both scrapped by 1936, all of the MC-2 and the two former MC-1 locomotives were rebuilt again into class AC-1 with a higher boiler pressure, but a lower overall tractive effort. The MC-2 rebuilds included installation of a new 41⁄4-BL Worthington feedwater heater as well.

SP used these locomotives until after World War II, retiring and then scrapping them in 1947 and 1948. The last locomotive of this class was scrapped on April 12, 1949, at SP's Sacramento shops.

References

  • Diebert, Timothy S.; Strapac, Joseph A. (1987). Southern Pacific Company Steam Locomotive Conpendium. Shade Tree Books. ISBN 0-930742-12-5.
  • Percy, Richard A. (2005). "Southern Pacific 'Cab Forward' Class MC-2". Railfan.net. Retrieved January 23, 2006.

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