This CD book contains George Melvin's exceptional series on EMD's GP20, the first turbo Geep. It documents the GP20's use by original owners and many of their subsequent owners and provides a photographic record of these engines. George also covers the history of the development of EMD Geeps as well as providing background on each road's locomotive purchasing records that led up to their acquisition of the GP20. You'll find photos of GP20s in use by all of its American buyers. CD contains 57 photos, of which 30 are in color. This CD book is a valuable research tool for both diesel modelers and railfans alike. Presented in PDF format (Adobe® Reader® 5.0 or later required), the text is fully searchable, and all of the high-resolution photos can be zoomed in on for close examination of every detail...something not possible with a printed version. Because the images are 300 dpi rather than the more common 96 dpi, readers can get an extremely close look at fine details. Pages can be printed for personal use. The 32-page series was first published in Model Railroading magazine between December 1999 and July 2000.