Well, I'll double check the gauge on it when we go back tomorrow, because if you click that link, it says O in the title, but says G gauge in the text. What is G gauge? bigger or smaller? Because the dimension quoted seems about like the one at the train shop and the guy at the train shop ~said~ it was O.
I wouldn't worry about the website. I distinctly remember looking for and finding "O Guage" on the box at the store.
I did a little googling, and it looks like "G" is a larger gauge, maybe double size from "O". But looking at that, if it is 23" high then the little lighthouse keeper dude would be about 5/8 to 3/4 or so tall... which seems about right for "O"... but maybe I'm wrong...