Just picked up my Sept/Oct 2010 Diesel Era yesterday and it has an article on EMD's GP15-1. This is part one and it includes units built for the CNW and Conrail. Part II will have units built for the Frisco and the MP. As usual there are lots of photos and some good background on the CNW and Conrail units. Looking forward to the next installment which should be out soon. BTW there is an interesting article on the Tulsa-Sapulpa Union RR included in this issue. Wish there had been more information on the railroad but the author did include present day industries served by the TSU.