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UP has the largest fleet of 6,000hp units, both SD90MAC-H and AC6000CW units. CSX has a small fleet of AC6000CW's CP has a handful of SD90MAC-H units. Nobody else has 6,000 hp units. Insofar as the reasons that these monsters have not become the standard in North American freight practice, the problems are manifold:including engine reliability and heavy wear and damage to the rails. These units were built for high speed freight service (in drag service such as coal trains, the slow speeds don't allow them to develop their maximum hp,meaning that they perform no better than lower horsepower units), in practice the railroads are finding that the a 3 unit set of 4,000-4,400 HP units offers better reliability and performance than two 6,000HP brutes, not to mention that AC propulsion is considered too costly for this type of service(unlike in heavy haul/drag service). It's too bad, one of the coolest railroad sights I've seen are pairs of AC6000CW's running on CSX's Boston line...................
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