The 7000-series of rail cars was ordered by the Chicago Transit Authority (CTA) for the Chicago "L". The base order is for 400 cars and will be used to replace the 2600-series cars, dating back to the 1980s, which are currently assigned to the Blue, Brown, and Orange Lines. If the CTA ordered the additional 446 cars, these cars would replace the 3200-series cars, dating back to the early 1990s, which are currently assigned to the Blue and Brown Lines. Including all options, which is a total of 656 cars, the order will cost $1.3 billion.

The Chicago Transit Authority (CTA) is the operator of mass transit in Chicago, Illinois, United States, and some of its suburbs, including the trains of the Chicago "L" and CTA bus service. In 2023, the system had a ridership of 279,146,200, or about 908,400 per weekday as of the fourth quarter of 2023.