Document and Entity Information	12 Months Ended
	Dec. 31, 2020 shares
Disclosure of classes of share capital [line items]
Entity Registrant Name	GUANGSHEN RAILWAY CO LTD
Entity Central Index Key	0001012139
Document Type	20-F
Document Registration Statement	false
Document Annual Report	true
Document Transition Report	false
Document Shell Company Report	false
Entity Incorporation, State or Country Code	F4
Document Period End Date	Dec. 31, 2020
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Filer Category	Large Accelerated Filer
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
ICFR Auditor Attestation Flag	true
H shares [member]
Disclosure of classes of share capital [line items]
Entity Common Stock, Shares Outstanding	1,431,300,000
A shares [member]
Disclosure of classes of share capital [line items]
Entity Common Stock, Shares Outstanding	5,652,237,000