Jane's 1938 says the DST had six berths on each side of the aisle, then in front of them was the "buffet" on the left and a compartment for two passengers on the right. Berths were 77 inches long, lowers were 36 inches wide and uppers were 30. In August 1937 American had three Douglases a day out of Glendale, all to Newark: DSTs at 1630 (three stops) and 2230 (six stops), and the 14-stop dayplane left in the morning. https://www.flickr.com/photos/michaelryerson/14654284144/