Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 163, § 9

The right of any corporation to erect poles, wires and other appliances in accordance with any permit granted under section six, and to operate trackless trolley vehicles upon the line designated in such permit, shall cease as to so much thereof as shall not be in operation within two years after the date of approval by the department, or within such further time as it may, after a hearing, grant.