After studying how new trade route system works, managed to achieve +6293 Money from number of Trade Routes.

BTW it is possible to gain higher score. In my game I have touched Science Victory when enemies sit in IV era. Wasn't able to trade resources they didn't invent yet.

Screenshot of game won in 212 turn. 6293 score.

mys 212.ctr

Score 6826 in turn 224.

mys 224.ctr

My final submission. Had fun enough ;)