ALCO DL-109

The ALCO DL-109 was one of six models of A1A-A1A diesel locomotives built to haul passenger trains by the American Locomotive Company between December 1939 and April 1945, the letters DL standing for Diesel Locomotive. They were cab units, with lead A units numbered DL-103b, DL-105, DL-107 and DL-109 and cabless booster B units DL-108 and DL-110, styled by the industrial designer Otto Kuhler with his three-piece windshield. A total of 74 cab units and four boosters were built, all developing 2,000 horsepower. The New Haven owned the most, 60 of the 62 DL-109s built, and used them in passenger service by day and freight by night under special permission from the War Production Board. The last runs came in the late 1950s in commuter service around Boston, and none of the Milwaukee Road units have been preserved.