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Thanks for that insight - just goes to show that numbers aren't everything - rated continuous tractive effort for the SD70MAC is 137,000 lbs., and 145,000 for the AC4400. Max. rated starting tractive effort is 175,000 for SD70MAC, 180,000 for AC4400. Question for you, Rodney, a two unit set of AC4400's is rated for 8,800 (hate to state the obvious), and 8,000 for two unit SD70MAC. Can you notice the difference in horsepower at higher speeds with the extra 800 hp (or extra 1,200 hp for three unit set)? <br /> <br />Also, in your opinion, do the AC4400's have any advantages over the SD70MAC - after all, the AC4400 has outsold the SD70MAC by a margin of greater than 2-1 (possibly close to 3-1). How about the rumor that BNSF switched over to the GE product in light of GM's switching of vehicle traffic to UP...
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