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On Sunday, the Chicago Transit Authority (CTA) began service of its newest rail cars on the Green Line.

One six-car train was added to the line’s existing fleet on Sunday, and additional trains will be added soon, CTA officials said in a prepared statement.

The new, 5000-series cars will replace the 35-year-old 2400-series cars used on the Green Line.

“The cars are a big part of our efforts to modernize the CTA and bring the system into the 21st century,” said CTA President Forrest Claypool.

The agency will continue to add 5000-series cars throughout the summer until the entire Green Line fleet is replaced. The cars then will be added to other CTA lines. The agency will receive 706 5000-series cars at a total cost of $1.14 billion.