The 2-8-2 arrangement allows the locomotive's firebox to be placed behind, instead of above, the driving wheels, allowing a large firebox that could be both wide and deep. This supported a greater rate of combustion and thus a greater capacity for steam generation, allowing for more power at higher speeds. Allied with the larger driving wheel diameter possible when they did not impinge on the firebox, this meant that the 2-8-2 was capable of higher speeds with a heavy train than a 2-8-0.

 

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