RELATED PARTY TRANSACTIONS - REVENUES COLLECTED AND SETTLED THROUGH CSRG (Details) - China State Railway Group Co., Ltd. [member] - CNY (¥) ¥ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of transactions between related parties [line items]
Passenger transportation	¥ 6,054,100	¥ 3,769,231	¥ 7,475,003
Freight transportation	1,701,842	1,456,605	1,740,907
Other transportation related services	8,488	24,048	74,870
Revenue arising from exchanges of goods or services	¥ 7,764,430	¥ 5,249,884	¥ 9,290,780

The amount of revenue arising from exchanges of goods or services.

No definition available.

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- Definition

The revenue from freight transportation services transportation related services.

+ References

No definition available.

+ Details

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- Definition

The amount of revenue from rendering of other transportation related services.

+ References

No definition available.

+ Details

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of revenue arising from the rendering of passenger transport services. [Refer: Revenue]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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