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A Chicago Transit Authority Green Line train passes the new Damen Ave. station Sunday, Aug. 4, 2024, near the United Center where the Democratic National Convention will convene Monday, August 19, in Chicago. (AP Photo/Charles Rex Arbogast)

A Chicago Transit Authority Green Line train passes the new Damen Ave. station Sunday, Aug. 4, 2024, near the United Center where the Democratic National Convention will convene Monday, August 19, in Chicago. (AP Photo/Charles Rex Arbogast)

Construction continues on the new Chicago Transit Authority's Damen Ave. Green Line station Sunday, Aug. 4, 2024, near the United Center where the Democratic National Convention will convene Monday, August 19, in Chicago. (AP Photo/Charles Rex Arbogast)

Construction continues on the new Chicago Transit Authority's Damen Ave. Green Line station Sunday, Aug. 4, 2024, near the United Center where the Democratic National Convention will convene Monday, August 19, in Chicago. (AP Photo/Charles Rex Arbogast)

Chicago Transit Authority employees work on the platform at the Ashland Ave. station Sunday, Aug. 4, 2024, near the United Center where the Democratic National Convention will convene Monday, August 19, in Chicago. (AP Photo/Charles Rex Arbogast)

Chicago Transit Authority employees work on the platform at the Ashland Ave. station Sunday, Aug. 4, 2024, near the United Center where the Democratic National Convention will convene Monday, August 19, in Chicago. (AP Photo/Charles Rex Arbogast)

A Chicago Transit Authority employee paints a post at the Ashland Ave. station Sunday, Aug. 4, 2024, near the United Center where the Democratic National Convention will convene Monday, August 19, in Chicago. (AP Photo/Charles Rex Arbogast)

A Chicago Transit Authority employee paints a post at the Ashland Ave. station Sunday, Aug. 4, 2024, near the United Center where the Democratic National Convention will convene Monday, August 19, in Chicago. (AP Photo/Charles Rex Arbogast)

A Chicago Transit Authority train pulls into the new Damen Ave. station just two blocks from the United Center Monday, Aug. 12, 2024, one week before the start of the Democratic National Convention in Chicago. (AP Photo/Charles Rex Arbogast)

A Chicago Transit Authority train pulls into the new Damen Ave. station just two blocks from the United Center Monday, Aug. 12, 2024, one week before the start of the Democratic National Convention in Chicago. (AP Photo/Charles Rex Arbogast)

A Chicago Transit Authority employee paints a post at the Ashland Ave. station Sunday, Aug. 4, 2024, near the United Center where the Democratic National Convention will convene Monday, August 19, in Chicago. (AP Photo/Charles Rex Arbogast)

A Chicago Transit Authority employee paints a post at the Ashland Ave. station Sunday, Aug. 4, 2024, near the United Center where the Democratic National Convention will convene Monday, August 19, in Chicago. (AP Photo/Charles Rex Arbogast)

A pedestrian and child walk past a Chicago Transit Authority employee as he makes repairs at the Ashland Ave. station Sunday, Aug. 4, 2024, near the United Center where the Democratic National Convention will convene Monday, August 19, in Chicago. (AP Photo/Charles Rex Arbogast)

A pedestrian and child walk past a Chicago Transit Authority employee as he makes repairs at the Ashland Ave. station Sunday, Aug. 4, 2024, near the United Center where the Democratic National Convention will convene Monday, August 19, in Chicago. (AP Photo/Charles Rex Arbogast)

Construction continues on the new Chicago Transit Authority's Damen Ave. Green Line station Sunday, Aug. 4, 2024, near the United Center where the Democratic National Convention will convene Monday, August 19, in Chicago. (AP Photo/Charles Rex Arbogast)

Construction continues on the new Chicago Transit Authority's Damen Ave. Green Line station Sunday, Aug. 4, 2024, near the United Center where the Democratic National Convention will convene Monday, August 19, in Chicago. (AP Photo/Charles Rex Arbogast)

A Chicago Transit Authority train pulls into the new Damen Ave. station just two blocks from the United Center Monday, Aug. 12, 2024, one week before the start of the Democratic National Convention in Chicago. (AP Photo/Charles Rex Arbogast)

A Chicago Transit Authority train pulls into the new Damen Ave. station just two blocks from the United Center Monday, Aug. 12, 2024, one week before the start of the Democratic National Convention in Chicago. (AP Photo/Charles Rex Arbogast)