Compound Steam Engine} is a technology discoverable in the late 1830s in a standard game of Imperialism.

It costs $7,000. It allows your engineers to build railroads into and out of hills (at $200 per tile), and to build depots (but not ports) there. You must wait another 50 years or so before you can put rail into mountains after the researching of Dynamite.

Also, your Foresters can at last, after waiting about 40 turns, upgrade hardwood forest to level 2, but at a rather steep $1,000 per tile.

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