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Here is a list of some of the world's most energy-efficient subway systems.
Energy efficiency makes sense for so many reasons...!
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According to the American Public Transportation Association (APTA), public transportation avoids the use of 4.2 billion gallons of gasoline annually in the United States. While public transportation can refer to a variety of modes, APTA attributes access to bus and rail lines with reducing U.S. driving by 4,400 miles, or approximately 223 gallons of gasoline per household, annually.