That's very good as it has the most popular sizes shown.
But what about Standard Gauge, On3 or 00? On3 is supposed to be a more scale like O scale size but runs on H.O. track. 00 was Lionel's attempt at making something similar to H.O. around the late 1950's to early 60's. Standard Gauge was one of Lionel's track sizes, in the 1930's(if I have the year correct), before G scale came along.
There are a few more sizes that I didn't list because I am not sure about all the other sizes that are made.
Lee Fritz