Lionel and Athearn collaborated on an adaptation of their O "Rectifier" that was designed (or maybe condensed) to fit the Athearn GP9 frame. There were Lionel versions (rare) and Athearn versions (mega-rare). After Lionel began to prodice it's own HO trains, the body die was used with their own running gear. They offered it in Virginian, New Haven (black and white with orange cab) and Pennsy (tuscan red with one gold stripe). It's kind of a neat "what-if" GE had made a 4-axle electric at that time. According to their catalogs it is based on the E33 - having seen them they don't look bad, especially for the period, except for the fact that there was no such thing.