I didn't playtested these cards yet, then their balance is yet unknown for me. I hope to do it soon.
Due the possible implications in modify the lenght of game, I suggest to use only some of them per play, in substitution to same number of original game cards (chosen randomly or not).
It's true. It seems that London never had any coal mines.
Actually, I did some researches to compose the cards, but, in this case, I didn't found a more thematic solution. I still thought about giving up this card or delaying the post, but as I liked that card so much, I choosed to privilege the mechanic instead the theme.
I'm open to any suggestions to a more thematic title, as well as any comments about the other cards, which can be revised in a future version.