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MP15AC

EMD MP15AC
Cp1422Mp15AcMilw2007.jpg
CP 1422. ex-SOO 1552, nee Milwaukee Road 486 MP15AC.
Type and origin
Power type Diesel-electric
Builder General Motors Electro-Motive Division, General Motors Diesel, Canada
Model MP15AC
Build date August 1975 – August 1984
Total produced 246
Specifications
Gauge 4 ft 8 12 in (1,435 mm) standard gauge
Prime mover 645E
Engine type V12 two-stroke diesel
Displacement 7,740 cubic inches (126.8 L)
Cylinders 12
Cylinder size 9 in × 10 in (229 mm × 254 mm)
bore x stroke
Performance figures
Power output 1,500 hp (1,120 kW)
Career
Nicknames Little Beaver
Locale North America
Type and origin
Power type Diesel-electric
Builder General Motors Electro-Motive Division, General Motors Diesel, Canada
Model MP15AC
Build date August 1975 – August 1984
Total produced 246
Specifications
Gauge 4 ft 8 12 in (1,435 mm) standard gauge
Prime mover 645E
Engine type V12 two-stroke diesel
Displacement 7,740 cubic inches (126.8 L)
Cylinders 12
Cylinder size 9 in × 10 in (229 mm × 254 mm)
bore x stroke
Performance figures
Power output 1,500 hp (1,120 kW)
Career
Nicknames Little Beaver
Locale North America

The EMD MP15AC is a 1,120 kW (1,502 hp) diesel switcher/road-switcher locomotive built by General Motors' Electro-Motive Division between August 1975 and August 1984. A variant of the MP15DC with an AC transmission, 246 examples were built, including 25 for export to Mexico, and four built in Canada.

The MP15DC’s standard Blomberg B trucks were capable of transition and road speeds up to 60 mph (97 km/h), allowing use on road freights. Soon 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 1,500 hp (1,120 kW) at 900 rpm Introduced in the SW1500, this was a supercharged 2 stroke 45 degree V type, with a 9 in × 10 in (229 mm × 254 mm) bore x stroke, giving 645 cubic inches (10.57 L) displacement per cylinder. The 645 series, introduced in 1966, was EMD’s standard engine through the 1980s.


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