EMD SD90MAC

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The EMD SD90MAC is a model of 6,000 hp (4,470 kW) C-C diesel-electric locomotive produced by General Motors Electro-Motive Division (EMD). It is, with the SD80MAC, the largest single-engined locomotives produced, and among the most powerful diesel-electric locomotives made by EMD, surpassed only by the dual-engined DDA40X. The SD9043MAC is the 4,300 hp (3,210 kW) variant, using a 16-cylinder 710G engine instead of the H-engine, which was originally intended as a temporary alternative while EMD tried to solve the H-engine's issues. However, the accompanying upgrade program was never utilized by its customers. The SD90MACs features include radial steering trucks with AC traction motors and an isolated safety cab which is mounted on shock absorbers to lessen vibrations in the cab. The SD90/43MACs and early 265H equipped SD90MACs are built with the WhisperCab like the SD70 series and SD80MAC, while later SD90MACs were equipped with the Phase 2 safety Cab with notches on the side of the nose similar to the SD70ACe. The SD90MAC, like the SD80MAC, SD70ACe, and SD70M-2, has a wide radiator section, nearly the entire width of the locomotive, which along with their size makes them easy to spot. As of 2025, most SD90MACs have been rebuilt, being the 4300hp SD90/43MACs. The SD90MACs equipped with the 16 cylinder 265H have long been scrapped. Norfolk Southern had rostered 110 SD90MAC locomotives purchased or traded from Union Pacific or the CIT Group respectively, that have now all been rebuilt as EMD SD70ACU locomotives. Canadian Pacific has also converted their small fleet of long-stored SD90/43MACs into SD70ACUs as well.