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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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