Hello neighbor!
It's been my experience that Trainz does show up in some retail stores, but not for a while after the preorder CD/DVDs from N3V have shipped to their customers. If I recall either TS9 or TS10 took almost half a year for it to show up over here, and even still most retail stores here didn't stock it in the shop, but could order it for you.
I would suggest just buying the CD/DVD from Auran (I also advise getting an FCT, if you don't have one... but thats besides the point). As you are directly supporting our favorite little game company, as well as having the ability to get it way before the retailers see it.
peter