The 3200 series is a series of Chicago 'L'

Chicago 'L'

The L is the rapid transit system serving the city of Chicago and some of its surrounding suburbs. It is operated by the Chicago Transit Authority...

 car built between 1992 and 1994 by Morrison-Knudsen. As of 2011, all of the 257 cars that were built remain in service. The bodyshells of these cars were built by Mafersa

Mafersa

Mafersa S.A. was a Brazilian manufacturer of passenger rail cars, buses and trolleybuses, and related components. It was founded in 1944 and was located in the city of São Paulo. At the end of 1997 it became a subsidiary of Alstom....

, of Brazil

Brazil

Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

, as a subcontractor to Morrison-Knudsen.

The 3200 series was the last series of five interoperable series of Chicago 'L' cars known as the High Performance Family, and the last cars ordered for the Chicago Transit Authority that use direct current

Direct current

Direct current is the unidirectional flow of electric charge. Direct current is produced by such sources as batteries, thermocouples, solar cells, and commutator-type electric machines of the dynamo type. Direct current may flow in a conductor such as a wire, but can also flow through...

 motors. Future train orders will use alternating current

Alternating current

In alternating current the movement of electric charge periodically reverses direction. In direct current , the flow of electric charge is only in one direction....

motors.