<P> Beginning April 28, 2008, the CTA began a six - month experimental ceasing of Blue Line operations on the Douglas Despite maintaining that the service cut was an experiment, the CTA covered Blue Line stations' directional signage for trains to 54th / Cermak with paint rather than temporary covering, suggesting it was a permanent discontinuation instead of a temporary one . All Douglas Branch operations are now served by the Pink Line . On December 4, 2008, CTA announced its decision to permanently discontinue Blue Line service on the Douglas branch and to make the Pink Line permanent . </P> <P> On October 15, 2015, the CTA announced that they now have full 4G wireless service on the Blue Line in between the Logan Square and Belmont stations . In the future this will mean that the CTA will be the largest rapid transit system with 4G coverage in subway tunnels and stations, this is targeted for the end of 2015 . </P> <P> The O'Hare Branch is the longest section of the Blue Line (14.6 miles (23.5 km)) and comprises both the oldest and newest segments of the entire route . The line starts at O'Hare International Airport in an underground station below the main parking garage, servicing Terminals 1, 2, and 3 . The line emerges in the median of the O'Hare main access road (Interstate 190) just northwest of Terminal 5, about a mile (1.6 km) west of Mannheim Road . The line runs in the median of Interstate 190 east through Rosemont . The line has a stop at River Road in Rosemont, which is also the location of one of the line's two storage yards, then tunnels beneath the Kennedy Expressway / Northwest Tollway interchange near the Des Plaines River . The line runs in the median of the Kennedy Expressway (Interstate 90) until a point southeast of Addison Street . South of Addison Street, the line exits the freeway and enters a subway under Kimball Avenue . The line travels under Kimball Avenue and Milwaukee Avenues through Logan Square . South of Logan Square, the line emerges above ground onto an elevated structure parallel to Milwaukee Avenue . This section of structure, built in 1895 as part of the Metropolitan Elevated's Northwest Branch, is the oldest portion of the Blue Line, and the sole section of the line on an elevated viaduct . The three stations on this section (California Avenue, Western Avenue, and Damen Avenue) are also the only three stations on the line to use side platforms instead of island platforms . </P> <P> At the intersection of Ashland and Milwaukee Avenues, the Blue Line descends underground, swings over to Milwaukee Avenue, and continues southeast towards downtown under Milwaukee Avenue (with stops at Division Street, Chicago Avenue and Grand Street), east under Lake Street (crossing beneath the Chicago River) (with a stop at Clark / Lake Streets), south under Dearborn Street through the Loop (with stops at Washington Street, Monroe Street, and Jackson Boulevard) and west under Congress Parkway (with stops at LaSalle Street and Clinton Street). The tracks emerge from a portal near Halsted Street in the median of the Eisenhower Expressway (Interstate 290) and continue west . Jackson provides a transfer tunnel to the Red Line . Until October 2006, a transfer tunnel existed at Washington as well . </P>

Where does the blue line end at o'hare