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Andre -- <br /> <br />I checked the Second Diesel Spotter's Guide on this one. It seems NW2 and SW7 production overlapped for a while in 1949. NW2s were built until December 1949; SW7 production began in October of that year. The Guide says that the curved windows were found on all NW2s, and on SW7s built through about April 1950. Later SW7s, as well as all SW9s and SW1200s had the rectangular windows above the hood.
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