Transit systems travel 'green' track
This year, the surging current of the East River will help provide power to a nearby subway station. The lights that lace the ornate interior of Manhattan's Grand Central Station have largely been replaced by bulbs that burn brightly but save energy. There are plans to make the rooftop of a Queens bus depot bloom like a garden. "Carbon footprint" has become part of the national lexicon, and mass transit systems throughout the country are taking steps to ease their impact on the environment even as they strive to provide more service to a growing number of riders.