Southbound Red Line trains operating through the Loop will be rerouted to the elevated tracks because of planned construction related to the Block 37 project.
Trains will be rerouted at 9 p.m. tonight until 5 a.m. Friday morning. It'll happen again at 9 p.m. Thursday until 5 a.m. Friday.
Southbound trains will be rerouted a third time at 11 p.m. Friday until 1 a.m. Monday.
You should allow extra travel times, the CTA says.
Read more about it here.