Some large U.S. transit systems are keeping mask mandates in place, for now.

By BY JILL COWAN, SOPHIE KASAKOVE, TARIRO MZEZEWA, ROBERT CHIARITO AND MATT BERG from NYT New York, Chicago, San Francisco and Boston continue to require masks, while Atlanta, Philadelphia and the nationwide Amtrak rail system have ended mandates.U.S. https://ift.tt/1W0BJEu
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