1905 - 32 Here's the biggest ship that replaced the biggest ship. Wikipedia:

When launched, Carmania and her running mate, Caronia, were the largest ships in the Cunard fleet.

Also:

In the spring of 1906, she carried H.G. Wells to North America for the first time; he noted in a book about his travels, "This Carmania isn't the largest ship nor the finest, nor is to be the last. Greater ships are to follow and greater".

Oh, put a sock in it, Herbert. Yes, yes, the future and all that.