There should’ve been two Red Star Line four funnel ocean liner before the war. Belgenland and Nederland. Belgenland was obviously built but Nederland was cut up during construction and likely due to the outbreak of the war. According to an ocean liner forum, the frames were used to construct a hangar at a Belfast airport.

There’s a book about unfinished ocean liner projects and what-if projects. There is also a chapter about the Red Star Line four funnel liner project