Increased axle loading has resulted in a corresponding increase in the maintenance work required on high angle manganese crossing frogs. The maintenance cycle is being reduced and the overall service life of manganese crossings is being shortened. The reality of heavy axle loading requires the railway industry to reassess basic crossing designs. There has been considerable improvements in the quality of turnout frogs. The focus on material integrity, manufacturing quality control, and rail hardness specification has produced Premium turnout frogs. These same factors along with specific design changes allow the production of Premium crossing frogs.
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