McGraw prepared the concourse for what would be a special delivery on Platform B.
At 2:36 a.m. Tuesday, Marwa Abdrabo gave birth to the first baby born at the World Trade Center since September 11, 2001, according to Port Authority officials.
"It was quick," McGraw told CNN Tuesday. "The guys looked to me to get in there and handle the situation."
Abdrabo, accompanied by her husband and her 2-year-old son, had been on the way to a hospital but the delivery would not wait, according to Port Authority police spokesman Joe Pentangelo.
Paramedics delivered the mother and her newborn daughter, named Asenat Abdrabo, to Beekman Downtown Hospital, Pentangelo said.
The healthy girl weighed 6 pounds, 5 ounces and was in stable condition, said Pentangelo.
News of the special delivery exploded over Twitter, including personal congratulations from New York Gov. Andrew Cuomo:
"Congratulations! @PANYNJ police delivered a baby on the WTC PATH platform early this morning—the first baby born at the WTC site since 9/11."
The World Trade Center's official Twitter account posted: "First Baby girl born this morning on Platform B at the WTC Transportation Hub this morning at 2:36 AM. Congrats to the parents!"
McGraw is a former Jersey City, New Jersey, emergency medical technician. It was his second assist on a delivery.
"I'll never forget this day," McGraw said.