Passengers wearing face masks travel on a metro train in New Delhi, India, on Sept. 12, 2020. Metro rail services in New Delhi Saturday morning resumed fully after remaining shut for over five months due to the ongoing COVID-19 pandemic, officials said. (Photos: Xinhua)

A passenger wearing a face mask is seen on a metro train in New Delhi, India, on Sept. 12, 2020. Metro rail services in New Delhi Saturday morning resumed fully after remaining shut for over five months due to the ongoing COVID-19 pandemic, officials said.

Photo taken on Sept. 12, 2020 shows an Airport Express Line train in New Delhi, India. Metro rail services in New Delhi Saturday morning resumed fully after remaining shut for over five months due to the ongoing COVID-19 pandemic, officials said.

Photo taken on Sept. 12, 2020 shows an Airport Express Line train in New Delhi, India. Metro rail services in New Delhi Saturday morning resumed fully after remaining shut for over five months due to the ongoing COVID-19 pandemic, officials said.