Being Canadian built they were good to go in Canada tax wise. To use them in the USA, CN paid the required duty to allow cross-border usage.
The reporting marks CNIS(CN), CVC(Central Vermont) and GTA(GTW very rare usage) are similar to the use of DWC.
They could and did use other car reporting marks cross border. But CN would have to pay duty on those other cars if they crossed the border. CN best interests were to use cars that they had already paid the duties for.
American built cars entering Canada also needed to have duty paid on them.
I'm not sure that the customs fee issue still exists post-NAFTA.
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