An Asian Australian woman has been racially abused on a Sydney train after asking a passenger to stop littering.

"You've got the rubbish on your f---ing head and your f---ing bags," a middle-aged blonde woman was filmed yelling at the frightened passenger on an evening service between Chatswood and Epping on May 11.

The younger passenger had allegedly approached the older woman and asked her to stop dumping rubbish on the train, ABC reports.

"No Americans, not anybody else, only Asia. Where's the f---ing money come from?" the woman continues.

Sydney Trains chief executive Howard Collins condemned the racial abuse.

"The sooner we understand what's going on the quicker we can get our police involved and deal with such people," he said.

The incident mirrors a similar attack on an Asian couple in a Sydney park in 2015. During that encounter a middle-aged woman with blonde hair can be seen berating the pair and allegedly demanding they give up their seat for another woman because she is white.

She was later charged and prosecuted.

Another video taken in 2015 on a bus also shows a middle-aged blonde woman sitting beside an Australian Asian woman and hurling insults at her.

"(You're a) f---ing ugly f---ing ch---," she says in the video.

"We all know what you are. Take your f---ing luggage and p--- off. F---ing ch---."