To start with, do you use the rule about trade range at all?
Each time we play it is completely forgotten.
Then a question about the actual rule:
For land trade it says 1 untill steam power, but at "start of game" it says 1 (city in an adjacent region), does this aply for all the 1s?
I interpret it as: when you reach Trade then your merchantdudes may travel across one unsettled province for trade.
how do you play?
Then i have another intresting scenario:
lets say player A B and C have their civs in europe, middle east and china.
if china theoretically have two resources of same type that i may sell and both A and B wants them. (A and C are not within trade range)
could B buy both resources and sell one of the bought resources to A?(for a little extra cash of course)