When they were new, the Mount's Enterprises had an rpm range of about 200 up to about 450. In their later years, they were not run above 390 to 400 unless absolutely necessary.
The new Cats idle at 550 and max at 1860. They're equipped with 4-to-1 reduction transmissions, giving shaft speeds of 137 to 465. Thus, a slower "dead slow" and a faster "flank" speed. "Full speed" is normally about 410.
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