The 2400-series was a series of Chicago "L" cars built between 1976 and 1978 by Boeing-Vertol of Ridley Park, Pennsylvania, with shells fabricated by Sorefame.

[3] 200 cars were built (numbered 2401–2600) and on October 31, 2014, the series was retired from revenue service.

The 2400-series cars featured smooth steel exteriors as opposed to the corrugated exteriors of the previous series, as well as all-fiberglass end bonnets as opposed to the stainless steel end bonnets with fiberglass window/headlight masks found on the previous series cars.

During the morning rush hour on October 31, 2014, the 2400-series operated its last revenue run on the Orange Line.

In addition, 24 cars were modified to continue life as nonrevenue maintenance vehicles until 2023.