In the 1970s, Canadian National and Canadian Pacific developed a standard 4550 cu. ft. 4-bay cylindrical hopper that became one of the most recognizable freight car families in North America.

From this platform, two variants were created - grain cars for agricultural products and potash cars for dry chemicals and fertilizers. The key visual difference is on the roof: grain cars use long trough hatches, while potash cars feature round, spaced loading hatches.

Thousands were built across multiple production runs by three manufacturers, with Hawker Siddeley alone contributing 15 variations. Many remain in service today across CN, CP, and other North American operators, seen in heritage schemes as well as later paint programs like the 2008 Saskatchewan Grain Car Corporation green scheme.

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