Guard rail check gauge:
The distance between the working side of frog heart rail and the working side of guard rail is called the guard rail check gauge of guard rail and point rail. It should be ensured that the wheelset is in the most unfavorable condition, and the side wheel is restricted by the guard rail without causing the other side wheel to hit the frog's center.
Guard rail check gauge (1391mm) = the maximum inside distance (1356mm) of locomotive wheelset + locomotive axle under force, the expansion value of the bottom net distance (2mm) + maximum flange thickness (33mm)
Guard rail face gage
The distance between the rail wing working edge to working edge of guard rail. This distance should ensure that the wheelset is not blocked by the wing rail and the guard rail at the most unfavorable conditions.
Back gage (1348mm) = minimum internal distance of locomotive (1350mm) - Reduced distance of the lower part of the wheel after loading of locomotive axle (2mm)
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