Reporters stand in a social-distancing area at the Senate Subway rail platform awaiting the arrival of members of the U.S. Senate, on Capitol Hill in Washington, U.S., December 3, 2020. REUTERS/Tom Brenner

A reporter walks past a protective social distancing sticker at the Senate Subway rail platform on Capitol Hill in Washington, U.S., December 3, 2020. REUTERS/Tom Brenner

A couple wearing mask rides on an escalator at a subway station amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 30, 2020. REUTERS/Kim Hong-ji

A man wearing a mask uses his mobile phone at his kiosk at a subway station amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 30, 2020. REUTERS/Kim Hong-ji

A man sleeps inside a subway station amid the spread of the coronavirus disease (COVID-19) in Santiago, Chile November 24, 2020. REUTERS/Ivan Alvarado

A woman looks at her mobile phone next to an exit of a subway station amid the coronavirus disease (COVID-19) pandemic at a shopping district in Seoul, South Korea, November 24, 2020. REUTERS/Kim Hong-Ji

Thailand's King Maha Vajiralongkorn greets royalists, as he inaugurates a new subway station, on the outskirts of Bangkok, Thailand, November 14, 2020. Picture taken November 14, 2020. REUTERS/Athit Perawongmetha

Thailand's King Maha Vajiralongkorn and Queen Suthida greet royalists, as they inaugurate a new subway station, on the outskirts of Bangkok, Thailand, November 14, 2020. Picture taken November 14, 2020. REUTERS/Athit Perawongmetha

Thailand's King Maha Vajiralongkorn and Queen Suthida greet royalists, as they inaugurate a new subway station, on the outskirts of Bangkok, Thailand, November 14, 2020. Picture taken November 14, 2020. REUTERS/Athit Perawongmetha

Thailand's King Maha Vajiralongkorn and Queen Suthida greet royalists, as they inaugurate a new subway station, on the outskirts of Bangkok, Thailand, November 14, 2020. Picture taken November 14, 2020. REUTERS/Athit Perawongmetha

Thailand's King Maha Vajiralongkorn and Queen Suthida greet royalists, as they inaugurate a new subway station, on the outskirts of Bangkok, Thailand, November 14, 2020. Picture taken November 14, 2020. REUTERS/Athit Perawongmetha

Thailand's King Maha Vajiralongkorn and Queen Suthida greet royalists, as they inaugurate a new subway station, on the outskirts of Bangkok, Thailand, November 14, 2020. Picture taken November 14, 2020. REUTERS/Athit Perawongmetha

Thailand's King Maha Vajiralongkorn greets royalists, as he inaugurates a new subway station, on the outskirts of Bangkok, Thailand, November 14, 2020. Picture taken November 14, 2020. REUTERS/Athit Perawongmetha

Thailand's King Maha Vajiralongkorn greets royalists, as he inaugurates a new subway station, on the outskirts of Bangkok, Thailand, November 14, 2020. Picture taken November 14, 2020. REUTERS/Athit Perawongmetha

Commuters wait for the subway as the coronavirus disease (COVID-19) outbreak continues in Mexico City, Mexico November 11, 2020. Picture taken November 11, 2020. REUTERS/Carlos Jasso

Commuters are seen inside the subway as the coronavirus disease (COVID-19) outbreak continues in Mexico City, Mexico November 11, 2020. Picture taken November 11, 2020.REUTERS/Carlos Jasso

Commuters wait for the subway as the coronavirus disease (COVID-19) outbreak continues in Mexico City, Mexico November 11, 2020. Picture taken November 11, 2020. REUTERS/Carlos Jasso

Commuters wait for the subway as the coronavirus disease (COVID-19) outbreak continues in Mexico City, Mexico November 11, 2020. Picture taken November 11, 2020.REUTERS/Carlos Jasso

Subway riders navigate their Saturday evening commute as the global outbreak of the coronavirus disease (COVID-19) continues, in New York City, U.S., November 14, 2020. REUTERS/Caitlin Ochs

A subway rider passes ads for face masks at Times Square station in Manhattan, as the global outbreak of the coronavirus disease (COVID-19) continues, in New York City, U.S., November 14, 2020. REUTERS/Caitlin Ochs

A sign reminds subway riders to maintain social distance when possible, as the global outbreak of the coronavirus disease (COVID-19) continues, in New York City, U.S., November 14, 2020. REUTERS/Caitlin Ochs

A subway rider wearing a mask passes a city-sponsored ad promoting face masks as a precautionary measure, as the global outbreak of the coronavirus disease (COVID-19) continues, in New York City, U.S., November 14, 2020. REUTERS/Caitlin Ochs

Subway riders pass an ad for face masks at the Times Square station in Manhattan, as the global outbreak of the coronavirus disease (COVID-19) continues, in New York City, U.S., November 14, 2020. REUTERS/Caitlin Ochs

A subway rider wearing a mask passes a city-sponsored ad promoting face masks as a precautionary measure, as the global outbreak of the coronavirus disease (COVID-19) continues, in New York City, U.S., November 14, 2020. REUTERS/Caitlin Ochs

Thailand's King Maha Vajiralongkorn and Queen Suthida greet royalists during the inauguration of a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

Thailand's King Maha Vajiralongkorn and Queen Suthida greet royalists during the inauguration of a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

Thailand's King Maha Vajiralongkorn and Queen Suthida greet royalists during the inauguration of a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

Thailand's King Maha Vajiralongkorn and Queen Suthida greet royalists during the inauguration of a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

Thailand's King Maha Vajiralongkorn and Queen Suthida greet royalists, as they inaugurate a new subway station, on the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Athit Perawongmetha

Thailand's King Maha Vajiralongkorn and Queen Suthida greet royalists during the inauguration of a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

Thailand's King Maha Vajiralongkorn and Queen Suthida greet royalists during the inauguration of a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

Thailand's King Maha Vajiralongkorn greets royalists, as he arrives with Queen Suthida to inaugurate a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

Thailand's King Maha Vajiralongkorn is seen during the inauguration of a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

Thailand's King Maha Vajiralongkorn and Queen Suthida greet royalists, as they inaugurate a new subway station, on the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Athit Perawongmetha

Thailand's King Maha Vajiralongkorn and Queen Suthida greet royalists, as they inaugurate a new subway station, on the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Athit Perawongmetha

Thailand's King Maha Vajiralongkorn and Queen Suthida greet royalists, as they inaugurate a new subway station, on the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Athit Perawongmetha

Thailand's King Maha Vajiralongkorn and Queen Suthida greet royalists, as they inaugurate a new subway station, on the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Athit Perawongmetha

Thailand's King Maha Vajiralongkorn greets royalists, as he arrives with Queen Suthida to inaugurate a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

Thailand's King Maha Vajiralongkorn greets royalists as he inaugurates a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

Thailand's King Maha Vajiralongkorn greets royalists as he inaugurates a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

Thailand's King Maha Vajiralongkorn greets royalists, as he arrives with Queen Suthida to inaugurate a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

Thailand's King Maha Vajiralongkorn greets royalists, as he arrives with Queen Suthida to inaugurate a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

Thailand's King Maha Vajiralongkorn greets royalists, as he arrives with Queen Suthida to inaugurate a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

A royalist carries a portrait of the king as they wait for the arrival of Thailand's King Maha Vajiralongkorn and Queen Suthida to inaugurate a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

A Royalist holds an umbrella next to portraits of the king as royalists wait for the arrival of Thailand's King Maha Vajiralongkorn and Queen Suthida to inaugurate a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

Thai Royal Guards get ready for the arrival of Thailand's King Maha Vajiralongkorn and Queen Suthida to inaugurate a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

Royalists hold portraits of the royal family as they wait for the arrival of Thailand's King Maha Vajiralongkorn and Queen Suthida to inaugurate a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

Royalists wait for the arrival of Thailand's King Maha Vajiralongkorn and Queen Suthida to inaugurate a new subway station at the outskirts of Bangkok, Thailand, November 14, 2020. REUTERS/Jorge Silva

U.S. Senate Majority Leader Mitch McConnell (R-KY) waits in the capitol subway after the Senate Republican GOP leadership election on Capitol Hill in Washington, U.S. November 10, 2020. REUTERS/Erin Scott

A woman takes a picture of a billboard wishing happy birthday to a K-pop singer Jimin at the subway in Bangkok, Thailand November 2, 2020. REUTERS/Chalinee Thirasupa

A woman walks past a billboard promoting a K-pop singer Park Yu Chun at the subway in Bangkok, Thailand November 2, 2020. REUTERS/Chalinee Thirasupa

A woman takes a picture of a billboard wishing happy birthday to a K-pop singer Jimin at the subway in Bangkok, Thailand November 2, 2020. REUTERS/Chalinee Thirasupa

A general view of a metro that crashed through a stop block and landed on an artwork of a whale tail at De Akkers subway station in Spijkenisse, near Roterdam, Netherlands November 2, 2020. REUTERS/Eva Plevier

Police officers stand near a metro that crashed through a stop block and landed on an artwork of a whale tail at De Akkers subway station in Spijkenisse, near Roterdam, Netherlands November 2, 2020. REUTERS/Eva Plevier

A general view of a metro that crashed through a stop block and landed on an artwork of a whale tail at De Akkers subway station in Spijkenisse, near Roterdam, Netherlands November 2, 2020. REUTERS/Eva Plevier

A general view of a metro that crashed through a stop block and landed on an artwork of a whale tail at De Akkers subway station in Spijkenisse, near Roterdam, Netherlands November 2, 2020. REUTERS/Eva Plevier TPX IMAGES OF THE DAY

A general view of a metro that crashed through a stop block and landed on an artwork of a whale tail at De Akkers subway station in Spijkenisse, near Roterdam, Netherlands November 2, 2020. REUTERS/Eva Plevier

A general view of a metro that crashed through a stop block and landed on an artwork of a whale tail at De Akkers subway station in Spijkenisse, near Roterdam, Netherlands November 2, 2020. REUTERS/Eva Plevier

Commuters take the subway in costume on Halloween wearing masks as precautionary measure during the outbreak of the coronavirus disease (COVID-19) in Brooklyn, New York, U.S., October 31, 2020. Picture taken October 31, 2020. REUTERS/Caitlin Ochs

Commuters take the subway in costume on Halloween wearing masks as precautionary measure during the outbreak of the coronavirus disease (COVID-19) in Brooklyn, New York, U.S., October 31, 2020. Picture taken October 31, 2020. REUTERS/Caitlin Ochs