MP15AC
EMD MP15AC
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| Performance figures |
| Power output |
1,500 hp (1,120 kW) |
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| Performance figures |
| Power output |
1,500 hp (1,120 kW) |
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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