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Photo: 500-series Opus Optima

Prototype bus #500 at Skokie Shops on June 17, 2006. The 500-series buses features a modified paint scheme to help differentiate them from standard CTA buses. (Photo by Robert Madison)

Prototype bus #500 at Skokie Shops on June 17, 2006. The 500-series buses features a modified paint scheme to help differentiate them from standard CTA buses.

Photo by Robert Madison
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