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2.23.5.1.1
For steels conforming to 2.23.2.1, the stresses in a guide rail or in the rail and its reinforcement shall not exceed 105 MPa (15,000 psi), based on the class of loading, and the deflection shall not exceed 6 mm (0.25 in.). The loads used to determine the guide-rail stress and deflection shall include vertical and moment loads transferred into the rail, that are imposed by equipment supported by the guide rail, combined with the horizontal forces imposed on the rail during loading, unloading, or running, calculated without impact (see 2.16.2.2 and 8.2.2.6).
2.23.5.1.2
Where steels of greater strength than those specified in 2.23.2.1 are used, the stresses specified may be increased proportionately, based on the ratio of the ultimate strengths.

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