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Yes, the "30" in GP30 was a sales gimmick, a GP"22" just didn't sound as powerful as a General Electric U"25"B. From the GP30 on, EMD used a simple number progression through the models. This progression usually went by fives or tens (30-35-40(-2)-45-50-60). EMD used a "38" for the 2000hp 645 engined GP38(-2)'s and SD38(-2) to make it clear that the 38-models were a non-turbo (less h.p.) version of the GP/SD40(-2) models. Where as if you said maybe a "GP45", naturally you would assume that it was a more powerful model. The "nines" models were generally used for expierimental, and custom/"special needs" models like the GP49 and GP59 (the GP39(-2) is an exception), other expierimental models had an X added to their designation (ex. GP40X, SD40X, SD45X). The GP/SD39(-2) used a "39" designation to indicate that it was more powerful than the GP/SD38(-2), but still not as powerful as the GP/SD40(-2) as the 39 series only had 2300hp. Another fact, the GP/SD28's (very, very few produced) are actually just a non-turbo version of the GP/SD35 as it used an 1800hp 16-567D1 for power. Is that enough info for ya'll?[}:)][:)][:D][8D][;)]
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