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What I'm suggesting is the same thing that's been posited before - that the horses have to work harder on the surface. Realistically, if the track was as easy to run on as say Melton or Menangle, then, assuming the ability of the horses were the same at Spreyton as said tracks [which I believe they are not] then the times run would indicate some degree of similarity. However, the times don't come anywhere near each other, even if you assumed that, generally speaking, Tasmanian horses were of lower ability than their mainland counterparts [again, something I consider to be mostly true].
So I feel as though I could reasonably infer that the track itself is slowing the horses to some degree; it's not intended as a significant analysis for presentation to the ABS.