Roads and Railroads

(city population * 1.1) + (capital population * .15) - 1
For each city connected to the capital, not including the capital.

The Machu Pichu wonder increases the modifier by 20%, to (population * 1.3) + (capital population * .15) - 1.

Arabia increases the constant by 1, to (population * 1.1) + (capital population * .15) - 0.
 
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