A 1951 Lionel 2026 2-6-4. I was three years old and my father was a struggling student on the GI Bill. My parents must have had to save up for it for months prior to Christmas, because we were dead broke at the time. I still have the 2026, and it still runs and looks like new. Still have the original cars from the set, too: a 6017 caboose, a NYC black gondola (with wooden barrels) and two Sunoco 2-dome tank cars. Oh, and the original 1033 transformer.
Thanks, Dad and Mom.