FILE - In this Sept. 3, 2015, file photo, an Amtrak train arrives to Union Station in Washington. Amtrak trains and along with regional partner trains across the U.S. plan to give two blasts of their horns Thursday afternoon, April 16, 2020, in a salute to transportation workers, as well as health care workers, first-responders, child care workers, grocery store employees and other workers providing essential services during the coronavirus pandemic. (AP Photo/Molly Riley, File)
