It happened around 4 p.m. on Friday, March 10, city police wrote in a press release. The victim was standing on the platform when "several juveniles" surrounded him, officials said.
One suspect punched the boy in the head and stole his phone, while accomplices "hit and kicked him" before taking more of his belongings, investigators believe.
Five suspects, seen in surveillance images published by Philadelphia police, are wanted in connection with the attack. Anyone with information can call or text PPD anonymously at 215-686-8477 or submit a tip on the department's website.
Click here to follow Daily Voice West Chester and receive free news updates.