No. 5704, last engine in the Canadian National's K-5-a series, pauses at the coaling facility in London, Ontario, at a date unspecified. The K-5 class, like the Canadian National System's earlier 4-8-4s, appear to have had the outside cradle or "banjo" frame which divided after the driving wheels to allow for a deeper firebox and more substantial four-wheel trailing truck. While this type of frame was prone to cracking at speed in the case of the U-3-a class of 4-8-4s and caused them to be limited to freight service, that problem does not seem to have surfaced with the U-2 class nor with these high-wheeled K-5 Hudsons. The transparency, attributed to Walter Taylor, appears here courtesy of Tom Rock of Rock on Trains.