EMD produce the GP9 from January 1954 – August 1963.The GP9 is powered by a 567C Roots blower prime mover rated at 1750 Hp A total of 4092 units.There was 165 GP9B built.The GP9 was built in a early and late models.The early GP9/GP9B had 4 36" fans while the late model GP9 had 2 48" fans..The GP9 was produce with and without DBs. Both Phillip Dodge mining and SP ordered low hood GP9s. Spotting features:The GP9 is readily identified by having one set of louvers on the side of the battery box ahead of the cab on the short hood.The GP7 had 3. A early GP9 http://www.trainweb.org/chessiephotos/photos/GP9/6144c&o.jpg A late model GP9 http://www.railpictures.net/viewphoto.php?id=136668 A GP9B http://www.railpictures.net/viewphoto.php?id=58715 Models: Walthers/Life Like makes the GP9 Atlas makes the GP9 in N Scale. I am not aware of any GP9B locomotives. Hi-Tech Details makes a B Unit Conversion Kit that fits the P2K GP9.Smokey Valley RR Products makes a Conversion Kit that fits the Athearn or Lionel GP7.