I remember that! Wow, takes me back to my younger years...(what, 12 years ago? That's half a lifetime...anyway....)
My grandma used to work at a Shell station way back when outside of Linglestown, PA (Gable's Truck Stop, now closed, for those of you familiar with the I-81 corridor around Harrisburg). She had bought the entire set for me for Christmas one year....it had the locomotive, tender, and a few other cars...it wasn't powered at all, and I don't even know if Atlas actually made the rolling stock or not. It did come with a loop of Atlas True-Track and an Atlas station (not even in a box, just a bunch of parts and instructions thrown together in a bag). And yes, it was 100% HO.