Yeah - I know. I just haven't been able to come up with a reasonable question that wouldn't come up on a google search. I don't believe the trivia question should be a measure of google technology and I certainly do not intend to use wikipedia for a reference source. [end of fuddy duddy rant]
You want trivia? Which major warship built in the last 60 years had a different propulsion plant from her sisters?
("major warship" disqualifies the frigate Glover, different though she may be)
As ever, you may come up with a reasonable answer that I had not thought of.