US rail company's one-word 'Trains' tweet starts viral Twitter trend

A one-word tweet by American train service provider Amtrak started a viral Twitter trend. After Amtrak tweeted, "Trains," US President Joe Biden followed with a tweet that read, "Democracy." NASA tweeted, "Universe," while American radio organisation NPR wrote, "Radio." American daily newspaper The Washington Post also joined the trend and tweeted, "News."