SAPS should question Mr Mokoena. He is inciting a crime.
One of their leaders, Albert Mokoena, warned Transport Department deputy director-general Maria du Toit at a meeting in Pretoria that commuters would resort to "drastic action" should the train service not improve.
"Before March 28 you must have responded to our demands. We have resolved amongst ourselves that it is really not good for us to burn our own trains [Metrorail trains]. We're going to burn the Gautrain," he said.
"I know that I am on record and I am doing this deliberately. It would be useless for us to burn our own property but that Gautrain is not for us, it's for the rich people. It's for the bourgeois," Mokoena said to cheers of approval from the crowd.
He said the department had not done a proper needs analysis for the majority of South Africans when it invested in the Gautrain.
"The money that was used to build the Gautrain was supposed to [be used for] the [transport system] of the majority. When you plan, you need to look at where the needs are," said Mokoena.
"That investment [in the Gautrain] was useless. We will burn those nice trains. This is not a threat. I am a politician and I use political language," he said.
Mokoena is the PAC's Tshwane regional secretary.
Another protester, Vusi Mahlangu, a law student at the University of SA, said using Metrorail trains was a "painful daily experience".
Thabang Mothelo wept as he addressed Metrorail officials about the "tribulations of train commuters".
"It is a very painful experience when 6000 people are crammed into one train. A cousin of mine was injured in a train accident and only got R7500. She is now a cripple.
"I use a train because we don't have a car. The government doesn't care about us, the people who vote. We shouldn't have to fight to get what we want," Mothelo said.
Du Toit said commuters' grievances would be taken into account in the department' s efforts to improve the Metrorail's service.
"I will investigate these challenges . These matters will be brought to the attention of the minister (Ben Martins) and there will be a response to this gathering.
"I would not like to see any trains being burnt, whether it [they are] Gautrain or Metrorail trains. The reason we travel is to make a contribution to this country," said Du Toit.