PBEM madness, also Power Grid (old post)
Recently I finished a game of Black Vienna courtesy of Greg Alecnevius' fine site, and started a second. I also did some play-by-email 18AL, 18GA, and 1861 game files.
Playing by email introduces a new set of complications. Since games extend over weeks or even months, it's common for real life to interfere with posting moves, at least in the short term. Having found Black Vienna in real life to be prone to disruption by player error, the online version is a true find. My regular group of players doesn't have the stamina for 18xx titles, which is absolutely fine and dandy - we get in a lot of other good games when we can.
Also, there's a new double-sided map for Power Grid coming out soon!