Brianna Satchell-Thomas, 31, of West Philadelphia, is charged with aggravated assault while DUI and related counts, city police told Daily Voice.
Authorities say the accident happened just before 6:30 a.m. on Sunday, Aug. 6. Police said they arrived to find Satchell-Thomas' white Mercedes-Benz with "major damage" near the trolley.
Four people were injured in the crash and were treated, police said.
Investigators claimed Satchell-Thomas "initially ... fled the scene" but "returned a short time later."
"An investigation into the incident has shown that the motorist ran a red light and struck the trolley at 52nd Street and Chester Avenue," SEPTA said in a statement.
"There was nothing the trolley operator could do to avoid the collision. There were four non-life-threatening injuries, including the operator and three passengers."
SEPTA said Satchell-Thomas is a maintenance custodian and was not on her way to or from work when the accident happened.
"SEPTA’s System Safety Division is continuing an investigation into the incident," transit authorities said.
Click here to follow Daily Voice Lower Merion-Narberth and receive free news updates.