I am having a hard time figuring out what setup makes a true real life scale O train. I am thinking of deciding on steam locomotives field, to be specific the "Big Boy" :mrgreen:, in O scale. But there is a couple varieties, O, On3, On27, On30, and whatever. One thing I figured out is, there is no three rails in real life, so that eliminates one type. From what I understand, O scale is not exactly true scale due to the rail width, that is in real life its 4 feet 8 inches, but if that is converted into O scale trains, it would not be accurate since it would be like 5 feet or something like that. On3 is O scale trains, but on HO tracks. Isn't that too narrow or would On3 be the closest to an accurate representation of a true real like scale?