A conductor checks a QR code of a passenger as proof of immunity to COVID-19 in public transport in Kazan, Russia November 22, 2021. REUTERS/Artem Dergunov 

A conductor checks a QR code of a passenger as proof of immunity to COVID-19 in public transport in Kazan, Russia November 22, 2021. REUTERS/Artem Dergunov 

A bus conductor in protective clothing waits for passengers on a bus stand as restrictions on public transportation are eased by the government following the outbreak of the coronavirus disease (COVID-19), in Kathmandu, Nepal July 14, 2020. REUTERS/Navesh Chitrakar 

A bus conductor checks the temperature of a passenger before getting inside the bus as restrictions on public transportation are eased by the government following the outbreak of the coronavirus disease (COVID-19), in Kathmandu, Nepal July 14, 2020. REUTERS/Navesh Chitrakar 

A bus conductor checks the temperature of a passenger before getting inside the bus as restrictions on public transportation are eased by the government following the outbreak of the coronavirus disease (COVID-19), in Kathmandu, Nepal July 14, 2020. REUTERS/Navesh Chitrakar 

A bus conductor puts up a sign for the route of a bus as restrictions on public transportation are eased by the government following the outbreak of the coronavirus disease (COVID-19), in Kathmandu, Nepal July 14, 2020. REUTERS/Navesh Chitrakar 

A driver (R) checks the body temperature of a conductor before driving a bus as restrictions on public transportation are eased by the government following the outbreak of the coronavirus disease (COVID-19), in Kathmandu, Nepal July 14, 2020. REUTERS/Navesh Chitrakar 

A conductor enters a train at Luxembourg railway station, as Luxembourg becomes the first country in the world to offer free public transport, February 29, 2020. REUTERS/Francois Lenoir 

A train conductor walks inside a carriage as passengers ride inside a Nairobi Commuter Rail Service (NCRS) train from the Mutindwa station during a strike by the Federation of Public Transport operators in Nairobi, Kenya November 12, 2018. REUTERS/Thomas Mukoya 

People sing with a conductor in the square in front of the Royal Palace, which has been transformed into a car-free zone for the day as part of "Mobility Week", in Brussels, Belgium, September 16, 2018. REUTERS/Eric Vidal 

A Trenitalia's conductor looks as the St. Peter Dome is reflected on a window of a Frecciargento's train at the Vatican railway station in Vatican May 28, 2016. REUTERS/Alessandro Bianchi 

A Trenitalia's conductor looks as the St. Peter Dome is reflected on a window of a Frecciargento's train at the Vatican railway station in Vatican May 28, 2016. REUTERS/Alessandro Bianchi 

A Trenitalia's conductor goes up on a Frecciargento's train at the Vatican railway station in Vatican May 28, 2016. REUTERS/Alessandro Bianchi 

Trenitalia's conductors look before to leave by Frecciargento's train at the Vatican railway station in Vatican May 28, 2016. REUTERS/Alessandro Bianchi 

A Trenitalia's conductor walks next to Frecciargento's train at the Vatican railway station in Vatican May 28, 2016. REUTERS/Alessandro Bianchi 

A performer dressed as Hello Kitty, poses with a conductor next to a Hello Kitty-themed Taroko Express train in Taipei, Taiwan March 21, 2016. The train will make its inaugural run on a round trip from Taipei to Taitung on Monday, according to the Taiwan Railways Administration (TRA). REUTERS/Tyrone Siu 

Pranom Chartyothin, a 72-year-old bus conductor, poses for a portrait while selling and collecting bus tickets in downtown Bangkok, Thailand, February 3, 2016. The World Bank estimates the working-age population will shrink by 11 percent by 2040, the fastest contraction among Southeast Asia's developing countries. Thailand's stage of economic development, the rising cost of living and education, and a population waiting longer to get married are among the reasons it is ageing more quickly than its neighbours. An effective contraception programme in the 1970s also played a part, said Sutayut Osornprasop, a human development specialist at the World Bank in Thailand. Picture taken February 3, 2016. REUTERS/Jorge Silva

Pranom Chartyothin, a 72-year-old bus conductor, counts coins with a colleague after selling bus tickets in downtown Bangkok, Thailand, February 3, 2016. The World Bank estimates the working-age population will shrink by 11 percent by 2040, the fastest contraction among Southeast Asia's developing countries. Thailand's stage of economic development, the rising cost of living and education, and a population waiting longer to get married are among the reasons it is ageing more quickly than its neighbours. An effective contraception programme in the 1970s also played a part, said Sutayut Osornprasop, a human development specialist at the World Bank in Thailand. Picture taken February 3, 2016. REUTERS/Jorge Silva

Pranom Chartyothin, a 72-year-old bus conductor, (2nd L) waits with colleagues for a bus in downtown Bangkok, Thailand, February 3, 2016. Such scenes will only become more common in Thailand as its population rapidly ages, unlike its neighbours with more youthful populations. The World Bank estimates the working-age population will shrink by 11 percent by 2040, the fastest contraction among Southeast Asia's developing countries. Thailand's stage of economic development, the rising cost of living and education, and a population waiting longer to get married are among the reasons it is ageing more quickly than its neighbours. An effective contraception programme in the 1970s also played a part, said Sutayut Osornprasop, a human development specialist at the World Bank in Thailand. Picture taken February 3, 2016. REUTERS/Jorge Silva

Pranom Chartyothin, 72-year-old rides in an empty bus while arriving to the terminal after selling bus tickets in downtown Bangkok, Thailand, February 3, 2016. Such scenes will only become more common in Thailand as its population rapidly ages, unlike its neighbours with more youthful populations. The World Bank estimates the working-age population will shrink by 11 percent by 2040, the fastest contraction among Southeast Asia's developing countries. Thailand's stage of economic development, the rising cost of living and education, and a population waiting longer to get married are among the reasons it is ageing more quickly than its neighbours. An effective contraception programme in the 1970s also played a part, said Sutayut Osornprasop, a human development specialist at the World Bank in Thailand. Picture taken February 3, 2016. REUTERS/Jorge Silva

Pranom Chartyothin, a 72-year-old bus conductor, sells and collects bus tickets in downtown Bangkok, Thailand, February 3, 2016. Such scenes will only become more common in Thailand as its population rapidly ages, unlike its neighbours with more youthful populations. The World Bank estimates the working-age population will shrink by 11 percent by 2040, the fastest contraction among Southeast Asia's developing countries. Thailand's stage of economic development, the rising cost of living and education, and a population waiting longer to get married are among the reasons it is ageing more quickly than its neighbours. An effective contraception programme in the 1970s also played a part, said Sutayut Osornprasop, a human development specialist at the World Bank in Thailand. Picture taken February 3, 2016. REUTERS/Jorge Silva TPX IMAGES OF THE DAY

A conductor stands next to a train inside the Beijing West Railway Station, in Beijing, China, February 1, 2016. REUTERS/Jason Lee 

A conductor (C) collects fares from candy floss sellers as they travel in a tram to a marketplace early morning in Kolkata, India, December 23, 2015. REUTERS/Rupak De Chowdhuri 

A bus conductor hangs out on a bus transporting passengers to Lagos business district, Nigeria November 23, 2015. Picture taken November 23, 2015.To match NIGERIA-POLITICS/ REUTERS/Akintunde Akinleye 

Sjaak Rijke, a former Dutch hostage freed from an al Qaeda-linked group in Mali arrives at the airport in Bamako, April 7, 2015. French commandos freed a Dutch hostage during a raid on an al Qaeda-linked group in Mali on Monday, French and Dutch officials said. The release of Rijke, a 54-year-old train conductor, comes more than three years after he was taken captive while on holiday with his wife in Timbuktu in November 2011. Rijke was taken along with two other captives, while his wife managed to escape. REUTERS/Adama Diarra TPX IMAGES OF THE DAY

Antoinette Lloyd walks along the tracks during her conductor trainee program at Norfolk Southern's Calumet Yard in Chicago, Illinois, January 13, 2015. Though traditionally a job perceived to be held by men, the company attempts to recruit more women into the program. Picture taken January 13, 2015. REUTERS/Jim Young

Antoinette Lloyd inspects rail cars during her conductor trainee program at Norfolk Southern's Calumet Yard in Chicago, Illinois, January 13, 2015. Though traditionally a job perceived to be held by men, the company attempts to recruit more women into the program. Picture taken January 13, 2015. REUTERS/Jim Young

Antoinette Lloyd inspects rail cars during her conductor trainee program at Norfolk Southern's Calumet Yard in Chicago, Illinois, January 13, 2015. Though traditionally a job perceived to be held by men, the company attempts to recruit more women into the program. Picture taken January 13, 2015. REUTERS/Jim Young

Antoinette Lloyd walks between rail cars during her conductor trainee program at Norfolk Southern's Calumet Yard in Chicago, Illinois, January 13, 2015. Though traditionally a job perceived to be held by men, the company attempts to recruit more women into the program. Picture taken January 13, 2015. REUTERS/Jim Young

Antoinette Lloyd is seen inside the locomotive car during her conductor trainee program at Norfolk Southern's Calumet Yard in Chicago, Illinois, January 13, 2015. Though traditionally a job perceived to be held by men, the company attempts to recruit more women into the program. Picture taken January 13, 2015. REUTERS/Jim Young

Stephanie Godley looks down the tracks during her conductor trainee program at Norfolk Southern's Calumet Yard in Chicago, Illinois, January 13, 2015. Though traditionally a job perceived to be held by men, the company attempts to recruit more women into the program. Picture taken January 13, 2015. REUTERS/Jim Young

Antoinette Lloyd inspects rail cars during her conductor trainee program at Norfolk Southern's Calumet Yard in Chicago, Illinois, January 13, 2015. Though traditionally a job perceived to be held by men, the company attempts to recruit more women into the program. Picture taken January 13, 2015. REUTERS/Jim Young

Stephanie Godley (R) works with conductor Elvis Carrales during her conductor trainee program at Norfolk Southern's Calumet Yard in Chicago, Illinois, January 13, 2015. Though traditionally a job perceived to be held by men, the company attempts to recruit more women into the program. Picture taken January 13, 2015. REUTERS/Jim Young

Stephanie Godley (R) speaks with Antoinette Lloyd during their conductor trainee program at Norfolk Southern's Calumet Yard in Chicago, Illinois, January 13, 2015. Though traditionally a job perceived to be held by men, the company attempts to recruit more women into the program. Picture taken January 13, 2015. REUTERS/Jim Young

Antoinette Lloyd sweeps snow off the tracks during her conductor trainee program at Norfolk Southern's Calumet Yard in Chicago, Illinois, January 13, 2015. Though traditionally a job perceived to be held by men, the company attempts to recruit more women into the program. Picture taken January 13, 2015. REUTERS/Jim Young

Antoinette Lloyd climbs up on a train during her conductor trainee program at Norfolk Southern's Calumet Yard in Chicago, Illinois, January 13, 2015. Though traditionally a job perceived to be held by men, the company attempts to recruit more women into the program. Picture taken January 13, 2015. REUTERS/Jim Young

Stephanie Godley switches a line during her conductor trainee program at Norfolk Southern's Calumet Yard in Chicago, Illinois, January 13, 2015. Though traditionally a job perceived to be held by men, the company attempts to recruit more women into the program. Picture taken January 13, 2015. REUTERS/Jim Young

Antoinette Lloyd checks a rail car during her conductor trainee program at Norfolk Southern's Calumet Yard in Chicago, Illinois, January 13, 2015. Though traditionally a job perceived to be held by men, the company attempts to recruit more women into the program. Picture taken January 13, 2015. REUTERS/Jim Young

Antoinette Lloyd (R) and Stephanie Godley review the track lines during their conductor trainee program at Norfolk Southern's Calumet Yard in Chicago, Illinois, January 13, 2015. Though traditionally a job perceived to be held by men, the company attempts to recruit more women into the program. Picture taken January 13, 2015. REUTERS/Jim Young

Antoinette Lloyd steps off a train during her conductor trainee program at Norfolk Southern's Calumet Yard in Chicago, Illinois, January 13, 2015. Though traditionally a job perceived to be held by men, the company attempts to recruit more women into the program to help fill the shortfall of conductors. Picture taken January 13, 2015. REUTERS/Jim Young

Antoinette Lloyd rides on the back of a rail car during her conductor trainee program at Norfolk Southern's Calumet Yard in Chicago, Illinois, January 13, 2015. Though traditionally a job perceived to be held by men, the company attempts to recruit more women into the program. Picture taken January 13, 2015. REUTERS/Jim Young

Antoinette Lloyd steps off a train during her conductor trainee program at Norfolk Southern's Calumet Yard in Chicago, Illinois, January 13, 2015. Though traditionally a job perceived to be held by men, the company attempts to recruit more women into the program to help fill the shortfall of conductors. Picture taken January 13, 2015. REUTERS/Jim Young

Antoinette Lloyd switches a line during her conductor trainee program at Norfolk Southern's Calumet Yard in Chicago, Illinois, January 13, 2015. Though traditionally a job perceived to be held by men, the company attempts to recruit more women into the program. Picture taken January 13, 2015. REUTERS/Jim Young

A Canadian Pacific (CP) Rail worker walks the picket line during the CP Rail rail strike in Moose Jaw, Saskatchewan, February 16, 2015. Canadian Pacific Railway CP.TO and the Teamsters Canada union have agreed to seek mediated arbitration, ending a one-day strike at the country's No. 2 railway, Canada's labour minister said on Monday. The government had planned to introduce back-to-work legislation on Monday afternoon to force more than 3,000 locomotive engineers and conductors represented by the Teamster Canada Rail Conference union back on the job. REUTERS/Todd Korol (CANADA - Tags: BUSINESS EMPLOYMENT TRANSPORT CIVIL UNREST) 

A Canadian Pacific (CP) Rail worker walks the picket line during the CP Rail rail strike in Moose Jaw, Saskatchewan, February 16, 2015. Canadian Pacific Railway CP.TO and the Teamsters Canada union have agreed to seek mediated arbitration, ending a one-day strike at the country's No. 2 railway, Canada's labour minister said on Monday. The government had planned to introduce back-to-work legislation on Monday afternoon to force more than 3,000 locomotive engineers and conductors represented by the Teamster Canada Rail Conference union back on the job. REUTERS/Todd Korol (CANADA - Tags: BUSINESS EMPLOYMENT TRANSPORT CIVIL UNREST) 

A Canadian Pacific (CP) Rail worker walks the picket line during the CP Rail rail strike in Moose Jaw, Saskatchewan, February 16, 2015. Canadian Pacific Railway CP.TO and the Teamsters Canada union have agreed to seek mediated arbitration, ending a one-day strike at the country's No. 2 railway, Canada's labour minister said on Monday. The government had planned to introduce back-to-work legislation on Monday afternoon to force more than 3,000 locomotive engineers and conductors represented by the Teamster Canada Rail Conference union back on the job. REUTERS/Todd Korol (CANADA - Tags: BUSINESS EMPLOYMENT TRANSPORT CIVIL UNREST) 

Canadian Pacific (CP) Railway workers walk the picket line during the CP Rail rail strike in Moose Jaw, Saskatchewan, February 16, 2015. Canadian Pacific Railway and the Teamsters Canada union have agreed to seek mediated arbitration, ending a one-day strike at the country's No. 2 railway, Canada's labour minister said on Monday. The government had planned to introduce back-to-work legislation on Monday afternoon to force more than 3,000 locomotive engineers and conductors represented by the Teamster Canada Rail Conference union back on the job. REUTERS/Todd Korol (CANADA - Tags: BUSINESS EMPLOYMENT TRANSPORT CIVIL UNREST) 

Commuters arrive from Vaudreuil-Dorion train station by special bus in Dorval, Quebec, February 16, 2015. A CP Rail strike left thousands of commuters from three major AMT commuter lines looking for alternate ways to get to work in downtown Montreal. Canadian Pacific Railway Ltd began operating a reduced freight schedule run by its managers on Sunday, after talks on a new contract broke down and more than 3,000 train engineers and conductors walked off the job. Canada's No. 2 railway and the Teamsters Canada Rail Conference failed to agree on terms including on scheduling and rest time. The railway reached a deal with a second union, Unifor, which represents safety and maintenance workers. REUTERS/Christinne Muschi (CANADA - Tags: BUSINESS EMPLOYMENT TRANSPORT CIVIL UNREST) 

Commuters arrive by special bus from the Vaudreuil-Dorion train station to a metro line at Cote Vertu in Montreal, Quebec, February 16, 2015. A CP Rail strike left thousands of commuters from three major AMT commuter lines looking for alternate ways to get to work in downtown Montreal. Canadian Pacific Railway Ltd began operating a reduced freight schedule run by its managers on Sunday, after talks on a new contract broke down and more than 3,000 train engineers and conductors walked off the job. Canada's No. 2 railway and the Teamsters Canada Rail Conference failed to agree on terms including on scheduling and rest time. The railway reached a deal with a second union, Unifor, which represents safety and maintenance workers. REUTERS/Christinne Muschi (CANADA - Tags: BUSINESS EMPLOYMENT TRANSPORT CIVIL UNREST) 

Commuters arrive by special bus from the Vaudreuil-Dorion train station to a metro line at Cote Vertu in Montreal, Quebec, February 16, 2015. Canadian Pacific Railway Ltd began operating a reduced freight schedule run by its managers on Sunday, after talks on a new contract broke down and more than 3,000 train engineers and conductors walked off the job. Canada's No. 2 railway and the Teamsters Canada Rail Conference failed to agree on terms including on scheduling and rest time. The railway reached a deal with a second union, Unifor, which represents safety and maintenance workers. REUTERS/Christinne Muschi (CANADA - Tags: BUSINESS EMPLOYMENT CIVIL UNREST TRANSPORT) 

Morning commuters wait for buses at the Cote Vertu metro station in Montreal, Quebec, February 16, 2015. Special buses dropped off commuters from the Vaudreuil-Dorion station looking to make their way downtown as train lines were cancelled due to a labour dispute with Canadian Pacific Railway. Canadian Pacific Railway Ltd began operating a reduced freight schedule run by its managers on Sunday, after talks on a new contract broke down and more than 3,000 train engineers and conductors walked off the job. Canada's No. 2 railway and the Teamsters Canada Rail Conference failed to agree on terms including on scheduling and rest time. The railway reached a deal with a second union, Unifor, which represents safety and maintenance workers. REUTERS/Christinne Muschi (CANADA - Tags: BUSINESS EMPLOYMENT CIVIL UNREST TRANSPORT) 

STM (Societe de transport de Montreal) bus inspectors direct commuters looking to make their way downtown at the Dorval station in Montreal, Quebec, February 16, 2015. Canadian Pacific Railway Ltd began operating a reduced freight schedule run by its managers on Sunday, after talks on a new contract broke down and more than 3,000 train engineers and conductors walked off the job. Canada's No. 2 railway and the Teamsters Canada Rail Conference failed to agree on terms including on scheduling and rest time. The railway reached a deal with a second union, Unifor, which represents safety and maintenance workers. REUTERS/Christinne Muschi (CANADA - Tags: BUSINESS EMPLOYMENT CIVIL UNREST TRANSPORT) 

An AMT (Agence metropolitaine de transport) worker directs commuters as they arrive from the Vaudreuil-Dorion train station by special bus in Dorval, Quebec, February 16, 2015. Canadian Pacific Railway Ltd began operating a reduced freight schedule run by its managers on Sunday, after talks on a new contract broke down and more than 3,000 train engineers and conductors walked off the job. Canada's No. 2 railway and the Teamsters Canada Rail Conference failed to agree on terms including on scheduling and rest time. The railway reached a deal with a second union, Unifor, which represents safety and maintenance workers. REUTERS/Christinne Muschi (CANADA - Tags: BUSINESS EMPLOYMENT CIVIL UNREST TRANSPORT) 

The Canadian Pacific railyard is pictured in Port Coquitlam, British Columbia February 15, 2015. Canadian Pacific Railway Ltd prepared to operate a reduced freight schedule run by its managers on Sunday, after talks on a new contract broke down and more than 3,000 train engineers and conductors walked off the job. REUTERS/Ben Nelms (CANADA - Tags: TRANSPORT CIVIL UNREST BUSINESS EMPLOYMENT) 

Canadian Pacific Rail workers walk the picket line outside of the CP Railyard in Pitt Meadows, British Columbia February 15, 2015. Canadian Pacific Railway Ltd prepared to operate a reduced freight schedule run by its managers on Sunday, after talks on a new contract broke down and more than 3,000 train engineers and conductors walked off the job. REUTERS/Ben Nelms (CANADA - Tags: TRANSPORT BUSINESS EMPLOYMENT CIVIL UNREST) 

A railyard worker walks along the tracks at the Canadian Pacific railyard in Port Coquitlam, British Columbia February 15, 2015. Canadian Pacific Railway Ltd prepared to operate a reduced freight schedule run by its managers on Sunday, after talks on a new contract broke down and more than 3,000 train engineers and conductors walked off the job. REUTERS/Ben Nelms (CANADA - Tags: TRANSPORT BUSINESS EMPLOYMENT CIVIL UNREST) 

A railyard worker walks along the tracks at the Canadian Pacific railyard in Port Coquitlam, British Columbia February 15, 2015. Canadian Pacific Railway Ltd prepared to operate a reduced freight schedule run by its managers on Sunday, after talks on a new contract broke down and more than 3,000 train engineers and conductors walked off the job. REUTERS/Ben Nelms (CANADA - Tags: BUSINESS TRANSPORT EMPLOYMENT) 

The Canadian Pacific railyard is pictured in Port Coquitlam, British Columbia February 15, 2015. Canadian Pacific Railway Ltd prepared to operate a reduced freight schedule run by its managers on Sunday, after talks on a new contract broke down and more than 3,000 train engineers and conductors walked off the job. REUTERS/Ben Nelms (CANADA - Tags: TRANSPORT BUSINESS EMPLOYMENT CIVIL UNREST) 

The Canadian Pacific railyard is pictured in Port Coquitlam, British Columbia February 15, 2015.Canadian Pacific Railway Ltd prepared to operate a reduced freight schedule run by its managers on Sunday, after talks on a new contract broke down and more than 3,000 train engineers and conductors walked off the job. REUTERS/Ben Nelms (CANADA - Tags: TRANSPORT BUSINESS EMPLOYMENT) 

Canadian Pacific Rail workers walk the picket line outside of the CP Railyard in Pitt Meadows, British Columbia February 15, 2015. Canadian Pacific Railway Ltd prepared to operate a reduced freight schedule run by its managers on Sunday, after talks on a new contract broke down and more than 3,000 train engineers and conductors walked off the job. REUTERS/Ben Nelms (CANADA - Tags: TRANSPORT BUSINESS EMPLOYMENT CIVIL UNREST)