After re-debuting in May on the Pink Line, six new Series 5000 rail cars were placed in service Sunday on the Green Line, the CTA announced.
Series 5000 cars will continue to be added throughout the summer until the entire current fleet Series 2400 cars is replaced. The Series 2400 cars are 35 years old.
Read details about the Series 5000 cars.
Here's a photo from chicago-l.org of a Series 2400 rail car.