by v8interceptor
EMDX 92 aka the SD89MAC demonstrator was rated for 4500HP
http://www.railpictures.net/showphotos. ... %20SD89MAC
As far as the failure of the SD90MAC-H and the 265 engine in the North American RR industry, it is worth noting that the initial problems with the prime mover happened at a time when GM was determined to sell off EMD as a "non core"(i.e not a passenger or light commercial highway vehicle builder) asset and I think that limited the amount of resources available to contine developing the 265 engine line. Under Greenbriar/Berkshire Holdings ownership there just was not the same amount of capital available for R&D.
I would note that at least one Class 1 railroad is satisfied enough with it's 6,000 HP units to rebuild them rather than retiring them, I refer to CSX's AC6000CW fleet which have been receiving 16 cylinder GEVO engines to replace their as built HDLs but which retain the full HP rating...
http://www.railpictures.net/showphotos. ... %20SD89MAC
As far as the failure of the SD90MAC-H and the 265 engine in the North American RR industry, it is worth noting that the initial problems with the prime mover happened at a time when GM was determined to sell off EMD as a "non core"(i.e not a passenger or light commercial highway vehicle builder) asset and I think that limited the amount of resources available to contine developing the 265 engine line. Under Greenbriar/Berkshire Holdings ownership there just was not the same amount of capital available for R&D.
I would note that at least one Class 1 railroad is satisfied enough with it's 6,000 HP units to rebuild them rather than retiring them, I refer to CSX's AC6000CW fleet which have been receiving 16 cylinder GEVO engines to replace their as built HDLs but which retain the full HP rating...