A plan to extend Chicago’s Red Line train is advancing as the Chicago Transit Authority shortlisted three design-build teams for the $3.6-billion project, and city planning commissioners adopted a development plan designed to accommodate the extension. 

After issuing a request for qualifications last fall, CTA announced this month that it had issued invitations to submit proposals to FH Paschen, Ragnar Benson, Milhouse and BOWA joint venture; Kiewit Infrastructure; and Walsh VINCI Transit Community Partners.