The Canadian National's five class U-4-a streamlined 4-8-4s, which Montreal Locomotive Works delivered in 1936, were high-speed passenger power and handled premier limiteds until the almost the end of steam operations. This builder's photo of No. 6400 comes from the collection of Wayne Koch. For the specifications of the U-4-a class, see the page for No. 6403. Today No. 6400 is preserved in Ottawa, in the collection of the Canada Science and Technology Museum.