Paul,?
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CPAA were American Built cars in International service.
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CPI were Canadian cars in international service.
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It was part of an international agreement that allowed cars to be used in international service without being charged duty on their construction.
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The different reporting marks was to prevent them from being loaded domestically in the opposite country of construction.
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There were a large number of leased cars with CPAA reporting marks, but that was not their significance.
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Of course NAFTA put an end to the need for the most part.?
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Ryan Laroche?
Sylvan Lake, AB