There is no way you could take roads and railroads out of a civ game like this. Just take away the infinite movement idea.
For Example:
Roads: 1/3 multiplier
Railroads: 1/5 multiplier
Simple
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"We don't know a millionth of one percent about anything."
-Thomas A. Edison
For Example:
Roads: 1/3 multiplier
Railroads: 1/5 multiplier
Simple

------------------
"We don't know a millionth of one percent about anything."
-Thomas A. Edison
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