In 1932, the time of this cutaway, this two-story Pullman berth intended to offer four rooms: two up and two down. Each room would have its own daybed, sink, and toilet.
The article implied that this arrangement was still in its testing phase, and that if it met “with favor,” the company would build more.
According to Rails West, this so-called duplex car was eventually built in large quantities.
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Source: Popular Mechanics August 1932