CTA THURSDAY NIGHT BLUE LINE WORK POSTPONED August 23, 2007 August 23, 2007 Staff 08/23/07Blue Line Single Track in Effect for Slow Zone Work The single track scheduled to be in effect from Grand to Division on the O'Hare branch of the Blue Line from 8 p.m. tonight until 4 a.m. Friday has been postponed.# # # Back to news