I've been doing some reading on the Lionel postwar trains, tracks, accessories etc, on postwarlionel.com. I see they made three types of track, 027, 0, and super 0. In reading the descriptions of each locomotive they don't indicate which trains run on which track. I understand that a train that can run on 027 can also run on 0. But did they make trains that only run on 0 or super 0? I feel like there is some basic key information I'm missing on the whole understanding of this era.