Tony Abbott and Campbell Newman have both condemned the passenger who launched a racist tirade against a security guard on a Brisbane train. ( ABC TV )

Prime Minister Tony Abbott has condemned a racist tirade against a security guard on a Brisbane train by a passenger, calling it "un-Australian".

Mr Abbott, speaking in Brisbane as part of a G20 volunteers' lunch, said he "absolutely deplored" the young man's verbal attack on the guard after being asked to take his feet off the seat.

The incident, which occurred October 2, was caught on video and posted online overnight.

A Facebook page believed to be that of the alleged offender last night issued an apology following claim earlier in the day that he was "proud to be white".

Queensland Police said two people were now assisting with an investigation into the incident.

"I think it's un-Australian to abuse someone in a public place just because you don't like the way they look, or you don't like the way they dress, or you make assumptions about what they believe," Mr Abbott said.

"That's completely un-Australian."

Queensland Premier Campbell Newman said he had spoken to the security guard, a man named Joe, and commended his behaviour.

"I have conveyed two things to him personally. Firstly, I thought he showed admirable restraint," Mr Newman said.

"I think he, from what I could see, responded very professionally in what was a very difficult situation, and I have thanked him for his great job as part of the Queensland Rail team.

"Secondly, I have conveyed to him my absolute disgust at what he was subjected to. I've told him how totally unacceptable it was."

Government will act if guard doesn't: Newman

Mr Newman said if the train guard did not make a complaint to police, the Government would take action on his behalf.

"We'll look at whatever we can do [to] go after this individual," he said.

"It was not on, totally inappropriate, and frankly just some sort of Facebook apology doesn't cut the mustard, as far as I'm concerned.

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"This is Australia, you’ve got to look after one another and respect one another."

Multicultural Affairs MP Glen Elmes said the full force of the law should be brought down on the "drunken imbecile" depicted in the video.

"Luckily, he is far from the typical Queenslander, who is tolerant and welcoming of people from all cultures," Mr Elmes said.

"All Queenslanders should condemn this sort of behaviour."

Queensland Rail issued a statement this morning describing the incident as "appalling" and offering its support to the guard.

Australia's Race Discrimination Commissioner Tim Soutphommasane took to Twitter this morning to condemn the man's actions.

"It's sad that someone doing their job should be subjected to such vile racist abuse. People should be held to account," he wrote.

Australian rapper Fortafy shared the video on his Facebook page late Saturday night, attracting almost 20,000 shares and 13,000 comments.

"Makes me feel sick that people are like this," he said.

A Facebook page urging retribution against the alleged offender gained more than 500 followers overnight.

Queensland Rail condemns 'anti-social' outburst

Queensland Rail took to social media on Sunday morning to condemn the man's behaviour.

"We are disgusted at the anti-social behaviour of this passenger towards one of our contracted security guards," it said.

"We strive to provide a safe workplace for our people and to see this occur is appalling.

"We congratulate the train guard on his response to ask the passenger to immediately leave the train."

Queensland Rail said it had contacted the guard's security company to offer its support to him.

"We would like to remind passengers that we have more than 8,200 CCTV cameras installed across the network; as well as Railway Squad police officers, mobile security, dog patrols and transit offers patrolling the network."

Alleged offender apologises on Facebook

A Facebook page purporting to be that of the alleged offender featured contradicting comments regarding the incident, with one post claiming the alleged offender was "proud to be white" before another apologised for the attack.

"I was just drunk couldn't remember shit so stop over reacting, but I am proud to be white!" a post on the site on Saturday night read.

It was followed up hours later with an apology, and a claim that an earlier post was not made by the alleged offender.

"I'm really sorry to everyone that was affected by the video I really can not remember anything out of all honesty the post made before was someone else I know this is no excuse," the post read, adding the admission that he had behaved like an "idiot".