Buses have temporarily replaced Green Line service between Coolidge Corner in Brookline and Cleveland Circle in Brighton while police investigate a minor accident this morning involving a trolley and a pedestrian.

"A trolley made contact with a woman as she attempted to walk across the Green Line tracks near Summit Avenue," MBTA spokesman Joe Pesaturo said.

Pesaturo said the woman was conscious and alert when she was transported to Brigham and Women's Hospital.