18US is a 'high-end' 18xx game of the entire history of US railroading (well, until the 1950s anyhow) on two map panels: twelve companies, four different categories of trains with either two or three levels of each (a total of eleven train types), and a substantially different set of mechanisms than the 'classic' 18xx games.18US is intended to appeal to those players who enjoy such games as 1837 and 1844: large games with many subsystems. - BoardGameGeek