I found this photo at My Link page Tom's Trolleybus Pictures, located to the right of Your computer screen at www.trolleybuses.net.

One of My happy memories growing up in Chicago during the 1960's and early 1970's, was riding and observing the electric trolleybuses operated by the Chicago Transit Authority.

This photo , that was taken on a July 28th, 1963 fantrip excursion, shows a CTA electric trolleybus that was built in 1948 by the St. Louis Car Company, at the west terminal loop for the CTA Rt # 12 / Roosevelt Road bus line at Roosevelt and Monitor.
This is just east of the Chicago city limits near the west suburban towns of Oak Park and Berwyn Illinois.