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Intangibles (Policies)
12 Months Ended
Dec. 31, 2023
Notes and other explanatory information [abstract]  
Intangibles

Intangibles are carried at acquisition cost, net of accumulated amortization and impairment charges.

 

The estimated useful lives are as follows:

   
    Useful life
Railway concessions   5 to 37 years
Research and development project   19 years
Software   5 years