I was never an electric toy train fanatic as a kid, but I remember being gifted with a five-piece set with tracks, a transformer and whatnot. I can’t recall if the maker was Lionel or Marx, but I do remember how heavy the engine car was (it really did weigh a fair amount) and that it generated a nice howling sound as it moved around the room and also emitted a simulation of steam. The electric current in the tracks was such that you could hear a faint throbbing or humming. If a strand or two of Christmas tree tinsel happened to fall on the tracks and the engine ran over it you’d hear a slight snapping sound and notice an odor of burnt whatever. I think I was seven or eight when the set arrived one Christmas. I think the purchaser (father, grandfather) was into trains for his own enjoyment, and that I hitched a ride.