The 2600-series cars (numbered 2601–3200) were manufactured by the Budd Company of Philadelphia, Pennsylvania, the same company that made the 2200-series, and first delivered to the CTA in 1981, in time for the upcoming O'Hare Airport extension of the Kennedy Line (now known as the northwestern end of the Blue Line). Originally, an order was made for 300 cars, but this order was later increased to 600 cars, all of which were delivered from 1981 until 1987. They were the last railcars to be built by the Budd Company, later renamed to Transit America. The cars were rebuilt by Alstom of Hornell, New York, from 1999 until 2002. They have few features to differentiate them from the earlier 2400-series cars, but nevertheless remain a mainstay of the "L".