Brandon Latimore, 21, faces a count of felony aggravated discharge of a weapon, Chicago police said.
Two more CTA employees have tested positive for coronavirus: a bus driver from the 77th Street bus garage, and a train conductor who worked out of the 95th street station.
The CTA said they have been in communication with the employees and those who may have had direct contact with them.
The two males got into an argument about 3:50 p.m. and fired shots while the train was in the first block of West 79th Street, Chicago police said.
Union leaders representing workers that have been deemed "essential" as Illinois battles the coronavirus called Monday for more protective gear to guard members against infection.
City health officials confirmed the driver, who operated a bus working out of the Forest Glen bus garage at 5914 W. Armstrong Ave., was diagnosed with COVID-19, according to a statement from the CTA.
There were no signs of trauma to his body, but the death remains under investigation by Area North detectives, police said.
The 49-year-old was found unresponsive about 2:50 a.m. under the Western Brown Line platform in the 4600 block of North Western Avenue, police said.
A 49-year-old man stepped off a train about 3:13 a.m. at the Garfield station, 220 W. Garfield Boulevard, when two men approached him, Chicago police said. They implied they had a weapon and demanded his items.
In each case, three or four people approached distracted passengers and snatched cellphones from their hands as Brown Line trains were approaching stations.
A person was stabbed at a CTA Red Line station Tuesday in the Loop.
The crash happened just after 4 p.m. near 79th Street and South Cottage Grove Avenue, according to Chicago Fire Department officials.
The charges against the man shot by police at a CTA station are being dropped.
A man died Saturday after getting caught between cars and dragged by a Red Line train at the Roosevelt station in the South Loop, prompting a nearly five-hour service disruption.
The head of the Chicago Fraternal Order of Police is standing behind the two officers involved in a shooting at a downtown CTA station Friday afternoon.
Chicago Mayor Lori Lightfoot said the video of police shooting a man inside a Red Line station is "extremely disturbing."
The FBI is helping the investigation into a police-involved shooting at a CTA Red Line station.
Several elevated CTA train stations are closed in the Loop Saturday as crews perform track maintenance.
A struggle broke out at the Grand station and both officers tasered the man, police said. At some point, one of the officers fired shots, striking the man twice.
The CTA operates the second-largest public transit system in the country, with about 1.5 million rides taken on an average weekday.