18xx series
18xx is the collective term used to describe a set of railroad-themed stock market and tile laying games. The 18xx set has two main branches: the 1829 branch (1829, 1825, 1853, and 1829 Mainline) and the 1830 branch (1830, 1856, 1870, etc). There are also a number of crossover games which sit somewhere between the two branches (eg 1860).
