The metro in the Indian capital, Delhi, has reopened more than five months after it was shut down to prevent the spread of coronavirus.
It's India's largest rapid transport system - it carried 2.7 million passengers a day before the lockdown.
Masks, social distancing and temperature checks are mandatory according to the new rules.
The move comes as case numbers continue to climb in India, with daily tallies of more than 80,000.
The country has so far reported more than 4.1 million cases, and 70,000 deaths.
Despite the risks, India continues to reopen because the economy is still reeling from the effects of a prolonged lockdown.
At least 12 other metro services across the country are also reopening today.
image captionTrains were sanitised before services resumed
Delhi has reported a recent uptick in cases and fatalities after the numbers dipped briefly. But the city has been steadily reopening, with bars set to open next week.
The metro, however, is especially risky given the volume of passengers, and the fact that it covers large swathes of the sprawling capital.
But officials have released detailed rules to curb the spread of the virus.
