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SD90/43MAC
The SD90/43MAC is externally identical to the SD80MAC but the 90MAC has the upgradable engine. This engine was originally supposed to have a 6,000 horsepower engine, but technical problems arose. This resulted in the first orders being downgraded to received 4,300 horsepower engines.
SD90MAC-H
The SD90MAC is identical to the upgradable SD90MAC except for the dual exhaust stacks and beveled twin-turbo 265H engine.
SD90MAC-H II
The cab and nose have been changed to accommodate rectangular windows and a full-height front door. |