According to Mazibuko, the agreement was simple - reinstate the workers and give them three months' back pay. Prasa would then find a way to pay them the rest of the 10 months' salary they were owed.
One of the strike leaders, Satawu shop steward Bulelani Ngxukumeshe, said he believed Prasa withheld Ngalwana's report because "it was clear that it was something that was against them. They don't want to share it with anyone."
Several sources who spoke on condition of anonymity said the agreement - and the failure to investigate train fires - were an attempt by the Prasa board to win Satawu's favour and satisfy political interests.
Sithole said from the current board's perspective there had never been an unwillingness to investigate the fires.
"In fact, we have even gone further to approach the law enforcement agencies to help us in terms of understanding what is really happening," he said.
"I can honestly say I was surprised that nothing at greater length and detail has been done about these matters, in spite of the fact that they have such an impact on the service and the credibility of the service we are offering."
Mazibuko denied Satawu had orchestrated train fires in the Western Cape and pointed fingers back at Prasa. "The last train that was burnt last year, we physically went there and did our own assessments," he said.
"How is it possible that you have deployed security officers there, you have surveillance cameras there, these trains keep being burnt but there is no-one who is apprehended?
"We agree with NTM in the allegation … that part of the Prasa management are involved in this thing."
NTM president Ephraim Mphahlele, who is a former president of Satawu, said he had evidence that Prasa management had burnt trains and conducted acts of sabotage in an attempt to discredit unions.
"Prasa had been instructing protection services security guards to burn trains during the NTM strike and they were then accusing NTM members who were on strike of burning stations," said Mphahlele.