In 1936 the Montreal Locomotive Works built five locomotives (6400-6404) for the Canadian National Railway. The CNR did extensive research using wind tunnel tests to keep smoke from swirling around the locomotive cab in their streamlined 4-8-4 design, however, they were fitted with non-streamlined Vanderbilt tenders. CNR gave the name Confederation to this 4-8-4 wheel arrangement. The Grand Trunk Western used the same design for their class U-4-b 6405-6410. CNR 6400 was displayed at the New York World's Fair of 1939. It is now on display at the National Museum of Science & Industry in Ottawa, Ontario.