Eastern Massachusetts Street Railway

The Eastern Massachusetts Street Railway (Eastern Mass) was a streetcar and later bus company in eastern Massachusetts, serving most suburbs of Boston, Massachusetts. Many of its former routes are now run by the Massachusetts Bay Transportation Authority.

The Eastern Mass connected to the Boston Elevated Railway (BERy) system at many points; through service continued along BERy trackage at some.

Former Eastern Massachusetts Street Railway car 4387, built in 1918 by the Laconia Car Company, is preserved in operating condition at the Seashore Trolley Museum, in Kennebunkport, Maine.