Russ Girling is prepared to accept that he is, for now, losing.

Pipelines built by companies such as Mr. Girling’s TransCanada Corp. carry the vast majority of the crude oil shipped around North America. This year, however, nearly 10 per cent of the volume of oil pulled from the ground in the U.S. will not flow through that massive network of buried steel. It will instead be loaded on to trains and race across the continent in a blur of tanker cars that is transforming the way North America’s energy moves.

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