Incorporated 1887 as West End Street Railway, leased 1897 to Boston Elevated Railway.
Boston Street Railway - sold 1887 to West End Street Railway.
Boston Consolidated Street Railway Co. - sold 1887 to West End Street Railway.
Cambridge Railroad Co. - sold 1887 to West End Street Railway.
Cambridge Street Railway - sold 1887 to West End Street Railway.
Arlington Street Railroad - leased to Cambridge Street Railway.
Somerville Horse Railroad - leased to Cambridge Street Railway.
Charles River Street Railway - sold to West End Street Railway.
Highland Street Railway Co. - sold to West End Street Railway.
Malden & Melrose Street Railway - leased to West End Street Railway.
Metropolitan Street Railway - sold 1887 to West End Street Railway.
South Boston Street Railway - sold 1887 to West End Street Railway.
Suburban Street Railway - sold 1888 to West End Street Railway.