A total of 42 Transport for London workers have died with Covid-19, according to Transport Secretary Grant Shapps.
Mr Shapps said it was unclear if the victims died as a result of doing their jobs. He told the Commons:
London mayor Sadiq Khan has been lobbying for masks to be worn where people cannot keep two metres apart, such as on public transport.
On Tuesday the Transport Secretary said people should make their own face coverings from an old t-shirt when travelling.
Mr Shapps urged people to think about the needs of others.