“ There, as in this case, the suing employee offered evidence that the injury was the result of equipment failure. In reversing a state court judgment setting aside a jury verdict for the employee, this Court said, in language fully apposite here: 'Only when there is a complete absence of probative facts to support the conclusion reached (by the jury) does a reversible error appear. But where, as here, there is an evidentiary basis for the jury's verdict, the jury is free to discard or disbelieve whatever facts are inconsistent with its conclusion. ”

“ Respondent introduced evidence that it was physically impossible for the accident to have happened in the manner claimed by petitioner, that the platform was virtually immovable, and that the equipment installed in the adjacent pit was put there to assure that the platform was in position when the men went to work and had nothing to do with the movement of the platform during the process of installing new wheels. ”

“ Petitioner offered additional evidence that prior complaints had been lodged with respondent about platform movements in similar and adjacent repair pits in which fellow employees were working and that safety equipment preventing platform movements had been installed in one of the adjacent pits but not in the pit where the accident occurred. ”