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I have no idea what the difference might be. Hybrid technology implies two or more sources of motive power....one needs to look no further than the Honda Insight, Toyota Prius or Ford Escape Hybrid for the concept. I would presume that GE has something similar in mind. Dynamic braking applies only to, ahem, braking, using the locomotives traction motors as generators, whose generated current passes through resistor grids to provide a load to slow the motors. GE's concept may use the traction motors to recharge batteries. It's an intriguing idea. <br /> <br />GE's high profile embracing of "green" technology is (IMHO) not quite as sincere as it may seem, although they have admitted that it's also good business, i.e.: there's money to be made by being green. A very big motivation, at least for their Transportation Systems Division, is that as of 1 January 2005, the US gov't. put into law the next tier of air pollution standards for diesel locomotives sold in the US. AC4400's wouldn't meet those standards, so now we have the ES series to meet those environmental standards.
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