The incident started around 7 p.m. with a fight between the man and woman, who police say are frequent visitors to the concourse near City Hall.
"I was coming off the train, and we were just seeing her laying on the ground. All these cops ran in and picked her up, and there was all this blood," Garcia said.
Another rider, who declined to give his name, told NBC 10 that, while the concourse is a very public place, people should always be aware of their surroundings.
"People gotta be safe out here. It's dangerous. Everywhere you go, you just gotta be mindful of what you're doing," he said.
SEPTA police say, in this case, the two knew each other, and this was not a random attack.
"They are both members of the vulnerable population that congregates in Center City," SEPTA Police Chief Thomas Nestel said.
Officers used a tourniquet to stop the bleeding. Medics rushed the victim to the hospital, and police say she is expected to recover.
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