Retired Chicago Transit Authority 3 unit articulated El Train.

This experimental 1945 built lightweight Rapid Transit train worked for the Chicago Rapid Transit Company -later the Chicago Transit Authority, and was retired in the late 1980's.
These cars worked their final years in service on the CTA Skokie Swift, now known as the Yellow Line rapid transit. Photographed in September 1990 at the Fox River Trolley Museum. South Elgin Illinois.