This is the best thing I found about 18xx games this year! An article full of charts, data, and connections between them. And it’s all just about 18xx games!
In order to collect all the information, the author studied the maps from the individual titles, the trains available in the games, the stock exchange, the game bank, private companies, and general mechanics. He put it all on charts and published it. Great respect! I know how much work he had to put into it, so I appreciate the effort and time he spent.
To interest you, I will say that one of the most interesting things is the world map with the locations where the games take place. Guess which country got a separate map?