EMD MP15DC Diesel-Electric Locomotive
The EMD MP15DC was a 1,500 hp (1,100 kW) switcher-type diesel locomotive model produced by General Motors' Electro-Motive Division between March 1974 and January 1983. 351 examples were built. An MP15AC variant, with an AC drive, was also offered. Between August 1975 and August 1984 246 MP15ACs were built, including 25 for export to Mexico, and four built in Canada. The MP15DC replaced the SW1500 in EMD's catalog, and is superficially very similar to the predecessor model, using the same engine (a V12 EMD 645-series powerplant) in a similar design of hood and bodywork. The primary difference is the MP15’s standard Blomberg B trucks.

Switchers up to the SW1500 had been restricted to AAR type A switcher or Flexicoil lightweight trucks, both with a 96 in (2,438 mm) wheelbase. In 1973, 60 special-order SW1504s were built for Mexico-only, on a slightly longer frame, allowing EMD’s standard Blomberg B trucks, with a 108 in (2,743 mm) wheelbase, to be used. In EMD's eyes (among others) this made the new locomotive a road switcher rather than a pure switcher, since it was capable of transition and road speeds up to 60 mph (97 km/h) or so. The new model MP15DC designation thus meant Multi-Purpose locomotive 1500 hp, DC generator. Originally the locomotive was simply designated the MP15; the arrival of the alternator/rectifier MP15AC in 1975 changed the name.

With the success of the MP15, there was a demand for a model with an advanced AC drive system. The MP15AC replaced the MP15DC’s DC generator with an alternator producing AC power which is converted to DC for the traction motors with a silicon rectifier. The MP15AC is 1.5 ft (457 mm) longer than an MP15DC, the extra space being needed for the rectifier equipment. The alternator-rectifier combination is more reliable than a generator, and this equipment became the standard for new diesel-electric locomotive designs.

The MP15AC is easily distinguished from the DC models. Instead of the front-mounted radiator intake and belt-driven fan used on all previous EMD switchers, these have intakes on the lower forward nose sides and electric fans. Side intakes allowed the unit to take in cooler air, and the electric fans improved a serious reliability issue found in its earlier DC sisters.

The MP15 used a 12-cylinder version of the 645E series engine developing 1500 hp at 900 r.p.m. Introduced in the SW1500, this was a 2-stroke, 45-degree V type, with a 9-inch bore by 10-inch stroke, giving 645 cubic inches displacement per cylinder. The 645 series, introduced in 1966, was EMD’s standard engine through the 1980s,

MP15DC Original Owners
Early railroad buyers were the Pittsburgh & Lake Erie, with 25, and the Missouri Pacific, who would buy 62 between 1974 and 1982. The Chicago & Northwestern (15), Southern Pacific (12), Louisville & Nashville (10), and Reading (10) made smaller orders. Later, from 1977 to 1982, Southern bought the largest fleet, 88 units under six names. Over 50 more were sold to 37 other customers. 

Owner - Quantity
American Cyanamid Company - 2
Aluminum Corporation of America (Alcoa) - 1
Alton and Southern Railroad - 1
Altos Hornos de Mexico - 5
Arizona Public Service - 1
Bauxite and Northern Railway - 2
Belt Railway of Chicago - 4
Birmingham Southern Railroad - 2
BC Hydro (Canada) - 3
Cambria and Indiana Railway - 2
Chicago and North Western Railway - 15
Cities Service Company - 1
W.R. Grace and Company - 4
Graysonia, Nashville and Ashdown Railroad - 1
Genesee and Wyoming Railroad - 2
Gulf Oil - 1
Georgetown Railroad - 2
Houston Belt and Terminal Railroad - 5
Industrial Minera de Mexico - 2
Kansas City Southern - 4
Kelly's Creek and Northwestern Railroad - 2
Lake Erie, Franklin and Clarion Railroad - 4
Louisville and Nashville Railroad - 10
Manufacturers Railway - 3
Metropolitan Sanitary District of Greater Chicago - 1
Missouri Pacific Railroad - 62
North Louisiana and Gulf Railroad - 4
Philadelphia Bethlehem and New England Railroad - 2
Pittsburgh and Lake Erie Railroad - 25
Point Comfort and Northern Railroad - 4
Quebec Iron and Titanium (Canada) - 2
Reading Railroad - 10
Rockdale, Sandow and Southern Railroad - 3
St. Louis - San Francisco Railway - 5
St. Mary's Railroad - 2
Southern Railway - 88
Southern Pacific Railroad - 12
Southern Railway of British Columbia - 3
Estech Inc. (Swift Chemical Co.) - 1
Tennessee Eastman (Eastman Kodak) - 1
Terminal Railway Alabama State Docks - 7
Texas City Terminal Railroad - 3
Texas and Northern Railway - 2
Union Railroad - 24
US Steel - 15

In the early 1970s railroads were starting to convert to AC power, the six largest buyers, Milwaukee (64), Southern Pacific (58), Seaboard (40), Nacionales de México (25), Long Island (23), and Louisville & Nashville (10), were all buying AC road locomotives. 36 more units were sold to 8 other customers.

Current owners
The Union Pacific Railroad is perhaps the largest current user of the MP15DC, having 102 of the type in service (Strack, 2004). None were originally owned by the UP; instead, they were acquired by merger or takeover, or bought on the second-hand locomotive market. The vast majority (62) came from the Missouri Pacific Railroad, while locomotives were also acquired from the Chicago and North Western Railway(14) and Southern Pacific Railroad (9). A further 15 were acquired from the Pittsburgh and Lake Erie Railroad, being surplus to their requirements, while a further two have been leased from Helm. The Alaska Railroad had four MP15DCs used as yard switching engines, numbered 1551-1554. As of 2/28/2011 LEF&C (1551)No. 25 & (1552) No. 26, 1553, 1554 were sold to GATX, a RR leasing fleet. Two were obtained from the Lake Erie, Franklin and Clarion Railroad; the other two were obtained from the Kelley's Creek and Northwestern Railroad. Caltrain has two MP15DCs used for yard switching and work train service, numbered 503 and 504. Southern Railway of British Columbia, the successor to BC Hydro Railroad, continues to operate its 3 units built in November 1975 (numbered SRY 151, SRY 152, and SRY 153) for switching and transfer work.

Former Milwaukee Road units are now owned by the Soo Line Railroad (an American operating subsidiary of the Canadian Pacific Railway); those not painted in the Canadian "Golden Beaver" scheme have worn a Soo Line patch job; those wearing it are often called "Bandits". Six former Milwaukee units returned to "home rails" in 2008, serving the growing regional Wisconsin & Southern Railroad WSOR in Milwaukee, Madison, and Horicon. In addition, Union Pacific has bought many examples on the used locomotive market. The New York & Atlantic Railway, which carries freight on Long Island, uses 4 former Long Island Rail Road MP15ACs to haul freight along with other ex LIRR locomotives. Two units sold new to the Department of Energy at Hanford, Washington are now in operation as Tri-City Railroad No. 16 and No. 15. The Knoxville and Holston River Railroad also owns a unit.

EMD MP15DC Overview
Type and origin
Power type: Diesel-electric
Builder: Electro-Motive Division (EMD)
Build date: February 1974–November 1980
Total produced: 351
​ • AAR B-B
Gauge: 4 ft 8 1⁄2 in (1,435 mm)
Trucks: 9 ft 0 in (2.743 m)
Wheel diameter: 40 in (1,016 mm)
Length: 47 ft 8 in (14.53 m)
Width: 10 ft 0 3⁄4 in (3.067 m)
Height: 15 ft 0 in (4.57 m)
Locomotive weight: 248,000 lb (112,000 kg)
Fuel capacity: 1,100–1,400 US gal (4,200–5,300 l; 920–1,170 imp gal)
Prime mover: EMD 12-645E
Engine type: V12 diesel
Aspiration: Roots-type supercharger
Displacement: 645 cu in (10.57 L) / cyl
Displacement: 7,740 cu in (126.8 L)
Generator: D32
Traction motors: 4 × D77/78 DC
Cylinders: 12
Cylinder size: 9 in × 10 in (229 mm × 254 mm)
Performance figures
Power output: 1,500 hp (1,100 kW)

See also:

Electro Motive Diesel


EMD Diesel-Electric Locomotives

Diesel-Electric Locomotives


Historic Rail - Shop Now!

Mosaic No. 212, an EMD MP15DC, at Brewster, Florida.

By Harvey Henkelman, Attribution, https://commons.wikimedia.org/w/index.php?curid=520648

Mosaic No. 212, an EMD MP15DC, at Brewster, Florida.

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