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500-series
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.

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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