The SD90MAC series was constructed in the 1990s for Union Pacific and Canadian Pacific; considered unsuccessful due to reliability issues with the 265H engine, all 265H-powered versions in North America and Australia have been repowered with 4300 horsepower 16V710G engines or scrapped.
The SD90MAC series was constructed in the 1990s for Union Pacific and Canadian Pacific 16V710G engines. The SD90MAC series was considered unsuccessful due to reliability issues with the 265H engine. The 265H engine was all 265H 16V710G engines. The SD90MAC series was powered versions in North America. Australia have been repowered with 4300 horsepower 16V710G engines. The SD90MAC series was scrapped.