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.