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Jason Dru hit the major differentiating feature separating the H's and the 4300 units. However, there is one other one if you are high ground you will notice. The 6000Hp units have two distinct stacks (two turbochargers) vs a single stack (one turbocharger) on the 4300hp units. Other than that, there is not much of a difference. The phase II sd90mac6000 units are definitely different. Different underframe and carbody (UP8522-UP8561). Phase I 6000hp up units are numbered 8500 to 8521. I hope that helps! Don
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