Because the population is denser there and the auto mobile is therefore inefficient as a means of transportation, a commuter rail system serving a given population is usually five times more efficient in a European city than it is in an American city.
a serving a given population is usually five times more efficient in a European city than it is in an American city
b serving a given population will usually be five times more efficient if it is placed in a European city instead of an American city
c will usually be five times more efficient in a European city than one serving a comparable population in an American city
d in a European city will usually be five times more efficient than will a system serving a comparable population in an American city
e that is implemented in a European city will usually be five times more efficient than if it is implemented with a comparable population in an American city
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a serving a given population is usually five times more efficient in a European city than it is in an American city
b serving a given population will usually be five times more efficient if it is placed in a European city instead of an American city
c will usually be five times more efficient in a European city than one serving a comparable population in an American city
d in a European city will usually be five times more efficient than will a system serving a comparable population in an American city
e that is implemented in a European city will usually be five times more efficient than if it is implemented with a comparable population in an American city
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