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Drainage of railway tracks:
Schematic example   BACK
                     

Interaction between: bedding height, pollution and load distribution in the gravel layer (Selig)
                     
Ideal situation after cleaning the bedding
Fig. 1
  Destroyed subgrade surface due to insufficient load distribution with too low bedding height
Fig. 2
  Destroyed subgrade surface due to insufficient load distribution caused by saturated soil and polluted bedding
Fig. 3
         
Fig. 1
Ideal situation after cleaning the bedding: enough height and good load distribution
Fig. 2
Destroyed subgrade surface due to insufficient load distribution with too low bedding height
Fig. 3
Destroyed subgrade surface due to insufficient load distribution caused by saturated soil and polluted bedding
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