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For each of the regional connection types (road, rail, water, air):
Gifts and resources can be traded with any city with which you have a rail, air, road, or ferry connection. The connections are created by plopping the appropriate mass transit building in each city. Worker and shopper sims will "commute" over these connections as well but the actual commuting is a rough simulation.
Services such as power, water, garbage, police, health, etc (pretty much everything else) can only be shared with cities with which you have a road connection with.
