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I was under the impression that GE AC locomotives had a separate inverter for each axle, while EMD locomotives have a single inverter for each truck. I read an article in Extra 2200 South that proposed some interesting questions of how this will affect wear patterns of wheels and that the long term effects have yet to be determined. The article was carefull not disclose any proprietary information, but proposed that wheel slip control of individual axels would promote increasing differences in wheel diameter over time, and that group control of axels should have an opposite effect of minimizing differences in diameter over time. <br /> <br />If space is a problem, then EMD's single inverter per truck might make more sense for a four axle locomotive. Group control of axel speed might also be better suited to a four axel locomotive if the long term effect of minimizing differences in wheel diameter proves to be important. <br /> <br />I just checked "GE Locomotives" by Brian Soloman, and it mentions A GE P32AC-DM built for New York city's third rail electric ( DM = Dual Mode) as a succesor to the FL9. Unlike other Amtrack units, it is using 3 phase AC for traction power.
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