Just finished reading thru this, it is interesting but omits a major factor. While Alco was slow to realize diesels held the future and therefore wasn't as far along in diesel loco development as it might have been, it was in good position prior to the start of world war 2. The article mentions that during the war, diesel production was curtailed, but this is not entirely true. EMD was allowed to continue producing diesels while Alco, Baldwin and Lima were told to build steam. The idea was to make most efficient use of raw materials and new designs were not permitted. So while Alco was building steam, EMD was contimuing to build the diesels which had been in production, mostly FT's and sawitchers, I believe. However, EMD did have the benefit of advancing their designs even if they did not immediately build new designs. So when the restrictions were removed, EMD had pretty much perfected their locos, while Alco had a lot of catching up to do. They never really did, obviously.
Gary