SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2020

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [abstract]

Schedule of fixed assets depreciation

Buildings (a)	20 to 40 years
Tracks, bridges and service roads (a)	16 to 100 years
Locomotives and rolling stock	20 years
Communications and signaling systems	8 to 20 years
Other machinery and equipment	4 to 25 years