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MATERIALS AND SUPPLIES (Tables)
 12 Months Ended
Dec. 31, 2021
Current raw materials and current production supplies [abstract]  
Schedule of materials and supplies
     2020      2021  
     RMB’000      RMB’000  
Raw materials
      197,242        190,328  
Reusable rail-line track materials
      43,584        39,002  
Accessories
      54,704        41,918  
Retailing consumables
      876        335  
    
 
 
     
 
 
  
       296,406        271,583