title: Chicago Central Area Transit Plan
context: In the summer of 1974, the CUTD selected a Core Plan, the initial portion of the Chicago Central Area Transit Project to be built. It consisted essentially of the Monroe Line, the Franklin Line, and a portion of the Randolph Line. The Core Plan, which would take about six years to complete and cost $1 billion based on an August 1973 cost estimate, was submitted to the Federal government on August 21, 1974. The Core Plan was received well, however, it was recommended that the project be reduced to $700 million. Modifications to the original Core Plan were made and the revised Plan was presented to UMTA in September 1974.
question: How long did it take to complete the Chicago Central Area Transit Plan?
answers: about six years