What ” guage ” is my old Lionel train set ?

Question by john m: What ” guage ” is my old Lionel train set ?
I have an old Lionel train set that my parents bought me from the 50’s . I would like to expand the set but I’m not into trains much and people tell me I have to make sure I get the right GUAGE !?!?!?

Best answer:

Answer by Samurai Hoghead
I believe it is called “O Scale 3 Rail.”