Chesapeake & Ohio Power in Color Volume 3: Volume 3: Second-Generation Power from Morning Sun Books final look at the C&O's motive power fleet. From the four Alco C630s to the 25 oddball GP15Ts, C&O owned 16 different second-gen models. Adding to the interest of this roster was a group of 30 GE U23Bs that rode on EMD Blomberg trucks. Other U-Boat models included the U25B, U30B, and later B30-7s. EMD products include GP30, GP35, GP38, GP40, GP39, GP40-2, as well as SD35, SD40 and SD50s.