The robbery happened around 12:50 p.m. on May 26th at the Glenwood SEPTA station at 2900 North Broad Street.
In a news release issued Friday afternoon, investigators say the victim was robbed by a man with a knife, the forced to an ATM machine where he was made to withdraw $60.
The suspect then fled in an unknown direction taking the cash along with the victim's wallet, credit card, and iPod.
The suspect is described as a black male, 20-22 years old with a thin build and a dark complexion wearing a black or navy blue hooded sweatshirt, dark-colored shoes, dark jeans and a red shirt.
Anyone with information is asked to contact Philadelphia Police at 215-686-TIPS (8477) or through www.phillypolice.com.