So, first of all, I have to comment on how unappealing I find international trade in this game compared to the extraordinary power of boosting your city production with intra-empire routes. I'm worried they are going to "fix" this problem by doing what they did in BE, which is give intra-empire routes a huge nerf. There are other ways to address the disparity: making the hike in production costs for districts not so damning, providing policy cards that generate more production and food from international trade, etc. Even making it so that an active trade route must exist for resources to be traded (or accessed through city-states). ANYWAY! Trading posts. The text says that the bonus to gold from trading routes is gained when passing through cities with a trading post, but what does this actually mean? Does the trade route have to go directly through the city center? How likely is this considering the AI for trade routes is extremely derpy. Seriously, the trade routes go the shortest route possible as the crow flies, completely eschewing existing roads and routes, so what the heck is the point of trading posts? Or, do they only have to pass through a city's controlled territory?