In Imperialism, around 1821-24 you can buy the Iron Railroad Bridge technology for $1,500.

With it, Swamp is now available for railroads, at a cost of $300 per section.

More importantly, the bridge enables the Forester unit, who can improve hardwood forest to level 1. Then he must wait for Compound Steam Engine in the late 1830s to go to level II.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.