QM2 isn't a proper RMS though, is it? It was given leave to carry the title but it is purely honourary.
And since the S stands for Steamer, not Ship... Shout QM2 not be called RMD QM2 where D=Diesel
Also, if you read your own quoted pages... It only really applies when in service as a RMS... Since this has never- and likely never will- apply to QM2, the point is well made.