While originally designed to house a 6000hp engine, technical difficulties resulted in many SD90MAC's being equipped with a 4300hp engine instead, which gave them the designation SD90/43MAC. The locomotives were reliable and effective enough with these engines that though the option to upgrade was given, most locomotives kept the as-shipped 4300hp AC traction engine.
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EMD SD90/43MAC San Luis & Rio Grande #115 -- HO Scale Model Train Diesel Locomotive -- #376390
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