Has anyone seen or done any list of what gives bonuses to internal trade routes? I know a city center gives 1 food + 1 prod and most districts give some bonus and there are policy cards that improve gains. I have looked my routes a bit more now and those things does not seem to add up. I give you an example. I have a game were I just killed off England and took all her cities. One of those cities currently only has a city center, a holy site with a shrine and a harbor. I have no other policies that affect it than +2 gold from all trade routes. So if a city center gives 1 food + 1 prod, a holy site gives 1 food and a harbor gives 1 prod I should get 2 food + 2 prod + 2 gold. But now when I try to send a trade route to it from my other cities they would get 3 food + 3 prod + 2 gold. Where does that extra food and prod come from?