Found!
It isn't only Cap Arcona, it's also Ile De France (1925->1960, 40000 tonns)
from wikipedia:
The War Years
At the war's outbreak, the
Ile de France was berthed at her New York pier. Since the French were not anxious to return the ship to its homeland, she was towed to
Staten Island by ten tugs and was laid up following special dredging that cost $30,000. Her crew of 800 was reduced to a security staff of 100 while she sat inoperative for the next five months. Then during
March 1940, under the command of the
British Admiralty, to whom she had been loaned, the ship was loaded with 12,000 tons of war materials, submarine oil, tanks, shells, and several uncrated bombers that were stowed on the aft open decks. On
May 1,
1941 she departed for Europe, veiled in gray and black. From there, she sailed to
Singapore where, following the
Fall of France, she was officially seized by the British.