Two additional projects were considered in the report .
Two additional projects were not recommended for immediate work : a circumferential route which would reappear years later as the Urban Ring , and an extension of Tremont Street Subway through service from Lechmere to Woburn via the Lowell Line .
Two additional projects were considered in the report but not recommended for immediate work : a circumferential route which would reappear years later as the Urban Ring , and an extension of Tremont Street Subway through service from Lechmere to Woburn via the Lowell Line .