Super Seis wrote:SD59M-2 is the EMD model number which reflects the fact that core units were SD-60's.
Alco 3000 and 3600 hp units had a seperate aftercooler radiator circuit some 40 + years ago-'tho the reason had nothing to do with emissions.
I've seen you post this elsewhere and you're the only person I've seen confirm that it's an official EMD model number.
The only reason I have any doubt is why hasn't the rebuild source affected the earlier rebuild designations in this program but suddenly is now? Did a inside source tell you this or are you assuming it?
In the past, something like that GP9 demonstrator that was rebuilt to help introduce the program hasn't been designated any different then a GP40 rebuild (Both would be designated a GP22ECO). It's purely been based on cylinders of the engine going in so far (GP22ECO for a BB getting a 8 cylinder 2150hp engine, SD22ECO for a CC getting a 8 cylinder engine 2150hp engine, and SD32ECO for a CC getting a 12 cylinder 3150hp engine).
Hasn't mattered in the past so I don't see why it would now. And it being a official EMD desgination is also suspect by not having ECO in the model designation. It's been there in the past for all rebuilds and it seems doubtful EMD would suddenly drop it rather then make it obvious it's part of the Eco program to help promote this rebuild program. Especially now when it seems to be gaining some momentum with things like the Union Pacific order and Norfolk Southern demonstrating some SD22ECO's.
I really think it's a Union Pacific designation and believe EMD is going to stick with calling them a SD32ECO.