SS Czar, or Царь in Russian, was an ocean liner for the Russian American Line before World War I. The ship was later known as Estonia for the Baltic American Line, Pułaski for the Gdynia America Line and as a British Ministry of War Transport troopship, and as Empire Penryn after World War II. The liner was built in Glasgow for the Russian American Line in 1912 and sailed on North Atlantic routes from Libau to New York. On one eastbound voyage in October 1913, Czar was one of ten ships that came to the aid of the burning Uranium Line steamer Volturno.