What is the most POWERFUL engine you have ever been behind?

zigs said

Actually in front of. While in the Navy I was stationed two years on a yard tug. It had 2,
426 Detroit diesels each about 1650 HP

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I was on a Fletcher class Tin can in the Navy. I'm not sure of power produced, but with all 4 boilers on line, she would do 39 knots.