Japanese railway company, Tokyu, says it now uses only renewable energy to power its train operations. That means Tokyu’s huge network of train lines in and around Tokyo do not produce any carbon dioxide emissions.

Tokyu, which employs 3,855 people and connects Tokyo with nearby Yokohama, is the first railroad operator in Japan to have achieved that goal. It says the carbon dioxide reduction is equivalent to the annual average emissions of 56,000 Japanese households.