Edwin Alexander, American Locomotives, 1900-1950; Bonanza Books 1950
In Canada this wheel arrangement was called "Jubilee" and the Canadian Pacific used them for light fast passenger service. Reading built four of these about 1915 for the same purpose. They were powerful and fast but apparently unstable. The railway rebuilt them in 1916 with a two wheel trailing truck.
You would think that an engine would be more stable with 4 wheels in the trailing bogie truck, rather than just 2.
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