In 2009, CTA released the results of its Alternatives Analysis Screen 3, in which it decided to begin early engineering work on Phase 2, due to its simple alignment through unpopulated areas and its relatively low cost (estimated to be $1.1 billion). Preliminary engineering work was performed on Phase 2. In addition to the new line, CTA planned to build four new stations as part of Phase 2, although three out of the four would be located along existing lines that the Circle Line will utilize. These would be at 18th/Clark, Cermak/Blue Island, Roosevelt/Paulina, and Congress/Paulina. 18th/Clark would be along the Orange Line in the Chinatown neighborhood, and would include a direct transfer connection to the Cermak/Chinatown station on the Red Line. Cermak/Blue Island would be located on the newly built elevated tracks in the Pilsen neighborhood. Roosevelt/Paulina would be located on the Pink Line in the Illinois Medical District. Finally, Congress/Paulina would be built above the Eisenhower Expressway, with a direct transfer connection to the Illinois Medical District station on the Blue Line. Existing stations would provide service near the United Center.