During the post-war era, the DW&P line was upgraded to handle an increase in freight and unit train traffic, such as potash, lumber and paper.

In 1960 CNR changed its name to "Canadian National/Canadien National" (CN) and introduced a radical new paint scheme and logo.

The company eventually opened its own three-story facility in West Duluth during spring 1913 although it was only used as a secondary terminal, primarily housing offices while also maintaining mail/express business.

[1] DWP began to play an increasingly important role for CN in the 1990s, following the implementation of the Canada-US Free Trade Agreement (FTA), and later the North American Free Trade Agreement (NAFTA), which contributed to increases in Canadian exports south and US imports north.

In 1995, the CNNA experiment ended and the name "Canadian National/Canadien National" with the CN acronym returned, only system-wide in both countries.

On May 10, 2004, CN purchased DMIR's parent company Great Lakes Transportation to give total control of the Winnipeg–Chicago corridor and remove the gap at Duluth between DWP and WC trackage.