well Edward9139 the Mauretania was a magnificent liner but as well as the oylimpic she became outdated and to much of a cost to keep running during the deppresion also the Cunard and the White Star Line when the merger took place each agreed to get rid of 1 liner and the Mauretania was just geting to old for competing against liners like the breman and the normandie
also she was scrapped in July 1935.

oh and 1 other thing the Mauretania's madien voagae took place
on November 16th 1907 and laid down in mid 1904 launched 1906.