Hello just bought a Lionel legacy big boy here. Now it says in Lionel listing it requires a minimum O-72 track.. is this scale?? I bought 2 different cars for this thing I got 2 scale box cars which are big, and 4 O-gauge passenger cars that look too small. The guy by my house owns a store says I want scale cars, as the loco is so big. This could cost me a lot of money if I don’t figure out what to buy here. Lionel says their high end stuff is a higher gauge, but I’m just getting into this and don’t know what that means..