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Vanilla Civilization V and Gods & Kings Trade RoutesEdit

A trade route is a link formed between a civilization's cities and its Capital5 Capital, which traders regularly use to move and conduct their trading. This might happen via land, using Roads (Civ5) roads, Railroads (Civ5) railroads, or via sea, using Harbor (Civ5) Harbors. A trade route is open with a city if one of the above-mentioned infrastructures is in place at the beginning of your turn.

Trade routes can be formed even if the connection is not direct. For example, if the capital has established a connection to City A via a Harbor, and City A is connected to City B using roads, then both cities are connected to the Capital5 Capital. As long as there is a transport chain ending in the capital, a trade route is opened and functional.

Note that for the Capital5 Capital to be accessible by sea, it needs either a Harbor built in it, or it needs a road/railroad connection to another city with a Harbor. So, for example, a connection won't be formed if the peripheral cities have Harbors, but the 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, the trade routes will be lost until the roads are repaired or the ships leave or are destroyed.

Once formed, trade routes earn certain amount of 20xGold5 Gold for the civilization. Every tile with a road or railroad costs 20xGold5 Gold per turn, meaning not all trade routes are necessarily profitable. The gold output for any trade route between a capital and a city is:

   Gold output = (City population * 1.1) + (Capital population * 0.15) - 1

For example, with a capital of 6 citizens,
a city with 4 citizens produces 4.3 gold per turn, 
while a city with 5 citizens produces 5.4 gold per turn.

Building Machu Picchu increases 20xGold5 Gold by 25% from each trade route. Prior to Brave New World, Arabia increases the 20xGold5 Gold output of each trade route by 1.

Brave New World Trade RoutesEdit

Main article: International trade route (Civ5)

In this expansion pack, trading has been redefined by introducing a new type of trade routes: international trade routes. Traditional trade routes between your own cities still exist, but have been renamed 20xCityConnection5 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.

The new type of trade routes may be labeled "International Trading," and are established manually - not only within your own civilization, but also with other civilizations or even city-states. Since in Brave New World 20xGold5 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.

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