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More than 30 traction companies have served Portland during the last 130 years.  This corporate flow chart is drawn from materials in the Tri-Met Library, including R. R. Robley's, "Consitituent and Allied Companies of Portland Railway Company" (Dec. 1935) and "City Lines, Portland Railway Division" (April, 1970).

Corporate Flowchart


 


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ETConsulting 2009