Correct me if I'm wrong, but according to my calculations it is always beneficial to chop down forests and mine or irrigate the base terrain as soon as you get railroads. A forest will always be 1 food, 2 shields and railroads do nothing for it. But if you chop down the forest then mine and railroad the base terrain, you will get 1 food, 3 shields for plains, and 2 food, 2 (or 3) shields for grasslands. You could also irrigate instead of mine and trade 2 food for 2 shields.
Consequently, you end up with a very ugly map with those mines covering everything.
Consequently, you end up with a very ugly map with those mines covering everything.
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