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GE Units and Strange Noises at Idle
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I could be wrong, but aren't all the newer locomotives' air compressors driven separately by electric motors, where older engines were direct drive from the prime mover crankshaft? <br /> <br />A compressor direct driven by an engine never stops running, but is "unloaded" by a small piston in the cylinder head that at a given pressure holds open the inlet valve. This means a compressor taking a load would begine to make pumping noises - kathunk, kathunk, kathunk, but not any of the noises associated with startup of a motor. <br /> <br />Air brake systems have two tanks, supply, and service. Supply tanks are for settling of condensate and whatever else might be in the air. The service tank is then for storage of clean air.
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