Dr. Grace's transatlantic ticket is on the ship Carpathia. The Cunard Line ship RMS Carpathia was the vessel that arrived within 2 hours of the RMS Titanic sinking in 1912 (9 yrs after this ep.) and rescued 705 of the survivors from the disaster. Carpathia crew are considered Heroes for dash to the Titanic through the same ice field that caused the disaster.
RMS Carpathia made her maiden voyage on 5 May 1903 from Liverpool to Boston, and continued this route until 1904. A German submarine torpedoed her on 17 Jul 1918; five crew members died when it sank.
This episode takes place in 1903.