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EMD uses a little trick to avoid turbo lag. They have the turbo set up so that it normally runs using the exhaust gasses, but if the engine is accelerating quickly there is a gear box connected at one end to the crankshaft and at the other end to a fluid coupling which spins the turbo faster than the exhaust gasses under those conditions but allows it to be driven by the exhaust otherwise. <br /> <br />The design of the turbo also has a good bit to do with how much smoke might occur under acceleration. At one point Baldwin used the same turbocharger that Alco used on the 244 because the turbo Baldwin normally used was not available. Those Baldwins smoked quite a bit, enough so that Baldwin quickly found a different turbo that worked and did not cause so much visible exhaust.
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