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The SD40 would have sold far more if it didn't have to compete with the SD45. But it the '66 line was introduced during the horsepower race so the stronger SD45 sold better. After a fwe years when the SD45 began to show its flaws, RRs that had bougth the 45s started buying the SD40. So by the time the dash-2 came out the race had settled down at 3000hp, and thus the stage was set for it to become the all time sales leader. I have read elsewhere that there were issues with the SD40 in the beginning so some RRs skipped to the 45.  As for the SD45-2 i understood that the mechanical problems associated with the 45s had been corrected in the last years of the SD45's production run. The dash-2 version didn't have those problems. 
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