The Greater Portland METRO is a regional public transportation system in Southern Maine. Operated by the Greater Portland Transit District, a transit district comprising Portland, Westbrook, and Falmouth, the system also covers Brunswick, Gorham, South Portland, Yarmouth and Freeport. METRO was formed in 1966.
METRO is Maine's largest public transportation agency. The transit system's annual ridership was 1,850,686 in 2017.
As of 2016, METRO operated a fleet of eighteen compressed natural gas (CNG) buses and fourteen diesel buses. It operates and maintains the only CNG fuel station in the state of Maine.
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