Four open-window commuter coaches built in 1930 by the Pullman Company in Chicago, and by the Harlan and Hollingsworth division of Bethlehem Shipbuilding for the Delaware, Lackawanna and Western Railroad (DL&W).
Ex-Reading Company (RDG) MUs # 9107, 9109, 9114, 9117 and 9124 were built between 1931 and 1932 by Harlan and Hollingsworth in Wilmington, Delaware.
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Mahlon Betts (1795–1867) was a carpenter, railroad car builder, shipwright, businessman, banker, and legislator who helped found three of Wilmington, Delaware's major manufacturing enterprises: the Harlan and Hollingsworth Company, the Pusey and Jones Company, and the Betts Machine Company.