Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Chicago Rapid Transit Company was a privately owned firm providing rapid transit rail service in Chicago, Illinois and several adjacent communities between the years 1924 and 1947. The CRT is one of the predecessors of the Chicago Transit Authority, Chicago's present mass transit operator. Leading up to the consolidation of the 'L' companies into the CRT was decades of the Chicago Elevated Railways Collateral Trust, an entity directly attributed to utilities magnate Samuel Insull.