My Uncle served on the Empress of Canada, he was adrift for 3 days in a lifeboat before being picked up, he was found to be to young to serve !. when he reached the required age he then served in malaya.
That would be the first Empress of Canada.
copied from elsewhere.
RMS Empress of Canada (1922), a 21,517-ton 653-foot (199 m) ship built in Glasgow, Scotland; Vancouver-based ship served the Far East; served as troopship in World War II; torpedoed and sunk off Africa by an Italian submarine in 1943; 392 of 1,800 aboard perished
RMS Empress of Canada (1928), originally the Duchess of Richmond; served as troopship in World War II; renamed Empress of Canada in 1947; caught fire and capsized in Liverpool in 1953; scrapped the following year
RMS Empress of Canada (1961), transatlantic liner providing service between Canada and the United Kingdom during the summer and cruising from New York City to the Caribbean in the winter; made 121 Atlantic crossings before being sold to Carnival Cruise Lines in 1971; later Mardi Gras, and Apollo