We got information that 18USA will be released by AAG soon. Although the game is very demanding, you have to reserve at least 7-8 hours for the game, but I think you must have 18USA in your collection (or 1817). Both games are based on similar mechanics and they introduce – among others – purchase of stock options. These are the titles where all the mechanics is focused on the stock exchange and if you’ve caught the 18xx bug, you won’t regret it.
More at: https://www.boardgamegeek.com/thread/2548393/article/36370288#36370288
and here too: https://all-aboardgames.com/pages/preorder-and-shipping-plans
do we know if it will be only stand alone or also as an expansion to 1817?
Both full game and expansion version will be offered for 18USA 🙂