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For the external trade routes introduced in Brave New World, see International trade route (Civ5).

Vanilla Civilization V and Gods & Kings Trade Routes[]

A 20xCityConnection5.png Trade route is a link formed between a civilization's cities and its Capital Capital, which traders regularly use to move and conduct their trading. This might happen via land, using roads roads, railroads railroads, or via sea, using Harbor Harbors. A 20xCityConnection5.png Trade route is open with a city if one of the above-mentioned infrastructures is in place at the beginning of your turn.

20xCityConnection5.png Trade routes can be formed even if the connection is not direct. For example, if the Capital Capital has established a connection to City A via a Harbor Harbor, and City A is connected to City B using roads roads, then both cities are connected to the Capital Capital. As long as there is a transport chain ending in the Capital Capital, a 20xCityConnection5.png Trade route is opened and functional.

Note that for the Capital Capital to be accessible by sea, it needs either a Harbor Harbor built in it, or it needs a road/railroad connection to another city with a Harbor Harbor. So, for example, a connection won't be formed if the peripheral cities have Harbor Harbors, but the Capital Capital itself has no sea access.

If an enemy pillages a road or uses ships to blockade a coastal city and there are no other connections to the Capital Capital, the 20xCityConnection5.png Trade routes will be lost until the roads are repaired or the ships leave or are destroyed.

Once formed, 20xCityConnection5.png Trade routes earn certain amount of Gold Gold for the civilization. Every tile with a road or railroad costs Gold Gold per turn, meaning not all 20xCityConnection5.png Trade routes are necessarily profitable. The Gold Gold output for any 20xCityConnection5.png Trade route between a Capital Capital and a city is:

For example, with a Capital Capital of 6 20xPopulation5.png Citizens, a city with 4 20xPopulation5.png Citizens produces 4.3 Gold Gold per turn, while a city with 5 20xPopulation5.png Citizens produces 5.4 Gold Gold per turn.

Building Machu Picchu increases Gold Gold by 25% from each 20xCityConnection5.png Trade route. Prior to Brave New World, Arabia increases the Gold Gold output of each 20xCityConnection5.png Trade route by 1.

Brave New World Trade Routes[]

Main article: International trade route (Civ5)

In this expansion pack, trading has been redefined by introducing a new type of trade routes: 20xInternationalTrade5.png International Trade routes. Traditional trade routes between your own cities still exist, but have been renamed 20xCityConnection5.png City connections, and function the same way as before. We can also think of them now as "Domestic Trading," done automatically as soon as you establish an infrastructural connection between a city and your Capital Capital.

The new type of trade routes may be labeled "20xInternationalTrade5.png International Trade" and are established manually - not only within your own civilization, but also with other civilizations or even CityStateIcon5.png city-states. Since in Brave New World Gold Gold production from terrain is significantly reduced, the new trade routes become vital for maintaining your finances. Because of the complexity of the new system, it enjoys a separate article.