Central Passenger Railway Co. - incorporated 1881, sold 1898 to Baltimore City Passenger Railway Co.
Baltimore Traction Co. - incorporated 1888, controlled North Baltimore Passenger Railway Co., Baltimore & Curtis Bay Street Railroad Co., Baltimore & Powhatan Railway Co., Citizens Railway Co., Peoples Railway Co., Pimlico & Pikesville Railway Co., Arlington & Pimlico Railway Co. Merged 1897 into Baltimore Consolidated Railway Co.
City & Suburban Railway Co. - incorporated 1892, consolidating Baltimore Union Passenger Railway Co., Highlandtown & Point Breeze Railway Co., Baltimore & Hampden Railway Co., Baltimore & Yorktown Turnpike Road, Baltimore Catonsville & Ellicott Mills Passenger Railway Co. Merged 1897 into Baltimore Consolidated Railway Co.
Lake Roland Elevated Railway Co. - incorporated 1892, consolidating North Avenue Railway Co., Baltimore Hampden & Lake Roland Railroad Co. Sold 1895 to City & Suburban Railway Co.
Baltimore & Northern Electric Railway Co. - opened 1897.
Gwynn Falls Street Railway Co. - owned by Baltimore Consolidated Railway Co.
Pimlico & Pikesville Railway Co. - owned by Baltimore Consolidated Railway Co.
Walbrook Gwynn Oak & Powhatan Railway Co. - owned by Baltimore Consolidated Railway Co.
Baltimore Gardensville & Belair Electric Railway Co.
Maryland Traction Co.
Shore Line Electric Railway Co.