The union representing rail workers claims overhead power lines that supply Perth's train network are not checked by qualified staff.
Train services on the Joondalup line were brought to a standstill last month when power lines came down on a moving train.
An investigation into the cause of the incident is under way.
The Rail, Tram and Bus union claims none of the employees working on overhead lines and signalling equipment are qualified to do so.
The union's Paul Robinson says training is urgently needed.
"If these overhead lines were to come down next to a train station it could be catastrophic," he said.
Mr Robinson says they have asked the Public Transport Authority for training but it needs to bring in someone from Queensland who is certified to do so.
He says the authority's response was unacceptable.
"We've said that we wanted training to happen immediately," he said.
"What they've come back with is at the best they're going to start training people in June of next year.
"This is totally inappropriate, totally unsafe, the public is at risk, our workers are at risk." The PTA has labelled claims of inadequate training as incorrect and disappointing.
PTA spokesman David Hynes says the claims are false.
"We have run quite happily, quite successfully, an extensive training programme so we offer training and a career structure for overhead workers, and that's been operating for years and years and years," he said.