I took this photo looking through the entrance gate, at the Chicago Transit Authority's large Forest Glen Garage located on Chicago's northwest side. Prior to the end of CTA electric trolley bus service on March 25th 1973, this facility and the former North Avenue Carhouse
( Now a large retail stripmall.) were major repair and garage facilities for the CTA trolleybuses.
Photos of this facility as a trolleybus garage can be seen at My links page "Tom's Trolleybus Pictures" to the right of Your computer screen.