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The majority of SD70MAC models were produced with the 4,000 horsepower (3,000 kW) EMD 710 prime mover while later units are rated at 4,300 horsepower (3,200 kW) and feature EMD SD45-style flared radiators.
The following is a list of locomotives produced by the Electro-Motive Corporation (EMC), and its successors General Motors Electro-Motive Division (GM-EMD) and Electro-Motive Diesel (EMD). Streamlined power cars and early experimental locomotives
The EMD SD60 is a 3,800 horsepower (2,800 kW), six-axle diesel-electric locomotive built by General Motors Electro-Motive Division, intended for heavy-duty drag freight or medium-speed freight service. It was introduced in 1984, and production ran until 1995.
The EMD SD90MAC is a model of 6,000 hp (4,470 kW) [1] C-C diesel-electric locomotive produced by General Motors Electro-Motive Division (EMD). It is, with the SD80MAC , one of the largest single-engined locomotives produced by EMD and among the most powerful diesel-electric locomotives, surpassed only by the dual-engined DDA40X .
The Indian locomotive class WDG-4 (EMD GT46MAC) is a type of six-axle freight-hauling diesel–electric locomotive with AC electric transmission designed by General Motors Electro-Motive Diesel [1] in 1997–1998 for Indian Railways, where they are classed as WDG-4.
Another broad gauge variant also came in 2012 only, that is, the EMD GT50AC, also known as the Indian locomotive class WDG-5, a smaller and lighter 135-ton variant, with an up-tweaked EMD 20N-710G3B-EC engine, capable of producing 5,500 HP (4.1MW) @ 910 RPM, to serve the Indian Railways, whose current tracks are weak to handle very heavy ...
Assuming the SD70MAC has followed more or less the same path as the 70M (after all, they were made at the same time, and the only difference is the AC inverters and traction motors), the 70MAC probably received the flared (that's the word I was looking for) radiators at about the same time.
Specifications; Configuration: ... Power output: 3,150 hp (2,350 kW) The EMD SD32ECO is a 3,150 ... and similar to late model SD70M and SD70MAC locomotives in ...