Lisa Robinson, 41, was on the train with her husband and son, five, when they were verbally abused by Cardiff City fans after a win over Millwall.
She stepped on to the tracks at Ystrad Mynach until police arrived.
The train was terminated and the fans had to end the journey on foot. British Transport Police are investigating.
Ms Robinson, a civil servant, and her husband Peter, 61, were on a day trip to Cardiff on 25 September to celebrate the their son's birthday and were returning home.
She said about 30 drunken Cardiff fans were on the Penarth-to-Bargoed Arriva Trains Wales service, celebrating their team's win after an early home kick-off against the London club.
She said things turned nasty when they began shouting sexist chants at a woman on the platform at Lisvane railway station and Ms Robinson asked them to stop.
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This woman is kind of my hero right now.