Metro trains are parked at a yard in New Delhi, India, on Sept. 2, 2020. India entered the Unlock 4 with effect from Tuesday. Fresh guidelines to be followed during Unlock 4 were issued last Saturday. Metro Rail services would be allowed to start from Sept. 7 in a graded manner, and public functions, or other congregations, would be allowed with a ceiling of 100 persons from Sept. 21. (Photo by Partha Sarkar/Xinhua)

Metro trains are parked at a yard in New Delhi, India, on Sept. 2, 2020. India entered the Unlock 4 with effect from Tuesday. Fresh guidelines to be followed during Unlock 4 were issued last Saturday. Metro Rail services would be allowed to start from Sept. 7 in a graded manner, and public functions, or other congregations, would be allowed with a ceiling of 100 persons from Sept. 21. (Photo by Partha Sarkar/Xinhua)

Metro trains are parked at a yard in New Delhi, India, on Sept. 2, 2020. India entered the Unlock 4 with effect from Tuesday. Fresh guidelines to be followed during Unlock 4 were issued last Saturday. Metro Rail services would be allowed to start from Sept. 7 in a graded manner, and public functions, or other congregations, would be allowed with a ceiling of 100 persons from Sept. 21. (Photo by Partha Sarkar/Xinhua)