Lionel's first dual motor SD-40 diesel came with the Collector Series Erie-Lackawanna Limited set of 1984. In addition to the SD-40, the set included an E-L lettered Stock Car, Box Car, Gondola, Covered Hopper, 6-wheel Crane Car, and Extended Vision Caboose. Not listed in the catalog, I've seen a dummy Erie-Lackawanna SD-40 with roadnumber and probably stock number 8459. The Erie-Lackawanna Limited was offered as separate release individual items and boxed in set (No. 6-1451) form, minus track and power pack.