The union representing transit guards and the State Opposition have lashed a WA Police decision to cut the number of officers policing Perth's public transport network.
About 80 officers in the public transport unit will be absorbed into the regional operations group, which has been primarily responsible for responding to out-of-control parties and public order incidents.
The new regional operations group will be split into three sections: north based at Maylands, south at Rockingham and central at Northbridge.
North and south will primarily deal with wild parties and the central unit of just 60 officers will focus on transport.
A police spokesman said the merger would provide a faster, more flexible service across the city as part of Frontline 2020 reforms designed to optimise police resources.
But the Rail, Tram and Bus Union, which represents WA's 250 transit guards, was not consulted. It said the move could endanger public safety and discourage public transport use.
"I'm concerned that the Government is calling it a reform when in actual fact it's a reduction in police numbers," union secretary Paul Robinson said.
"In our view, it's about money, it's about cutbacks and it's going to impact heavily on the security of the rail system."
He tipped more vandalism, antisocial behaviour and passengers being hurt.
"My members have to pick up the pieces," he said. "We need the police to assist transit officers in dealing with really bad situations and we've had a number of them, with the Armadale line the worst."
Shadow transport minister Ken Travers said just as with education, funding cuts were "dressed up" as reforms.
"The police just don't have the numbers," he said.Police Minister Liza Harvey said the Government was committed to safety on public transport.