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"rated" output cannot be exceeded, my experience is with gen sets not locomotives, but the answer is the same, rated output cannot be exceeded. If load increases beyond rated output, exitation is lowered or stopped depending on design. This is called "dropping the load". It is necessary to design a unit this way to protect itself from overload damage. <br /> <br />An engine's rpm can drop as the unit is being loaded, but that is a function of governor design. A "droop" governor falls from "high idle" - maximum no load speed, a predetermined amount to "rated speed" - full load rpm. A governor without droop is called an isochronus governor. <br /> <br />So, when you are load testing, you are looking to achieve a certain number, if you get it, your job is done. If you exceed that number, something is wrong, just the same as if you couldn't get the number.
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