There are still a lot of DC drive motive power out there. If I'm not mistaken AC drives came of age in locomotive power with the advent of power inverters that work by altering AC sinewaves to the motors. Couple these with computer control (that's working correctly) and the whole system works to maintain programmed parameters hundreds if not thousands of times a minute based on feedback from a zillion sensors. This continually tweeks everything from fuel feed to wheel slip to maintain peak efficency. The engineer basically blows the horn at grade crossings and catches h**l if his train is 2 milliseconds late. DC drive is very powerful but woefully inefficent.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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