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B-B vs. A-1-A
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I'd have to agree with GP40-2's post. The upper .20's to .30 is the max adhesion DC diesel locos can sustain. The AC diesel's big advanatage/sellingpoint is that they can easily sustain well into the .30's and even the .40's The Trains issue on AC locos (both EMD's and GE's) from maybe 18 months - 2 years ago discussed this. I'm at work, so I can't tell you the month/yr of that issue, but I'll look it up when I get home. <br /> <br />I'm no expert so feel free to correct me where I'm wrong, but think it's really because of the nature of the DC traction motors and electricals (which can have a starting effort in the upper .30's, but will fry if they try to sustain those higher levels of efficiency for very long), vs the nature of the AC traction motors and electricals (which don't don't have those same issues of frying.) Some of the newer SD MAC's are thought to be capable of sustaining adhesion even into the .40's all day long, whereas the late model DC SD's max in the upper .20's <br /> <br />I just did a google search and found this interesting link. Many here know Kevin: <br /> <br /> http://www.trainweb.org/eastpenn/sd80mac.html <br /> <br />It deals directly with the SD80MAC's, but it's the same for all AC / DC locos. <br /> <br />Enjoy the hobby! <br /> <br />Greg
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