Transport for NSW chief operations officer Howard Collins said many of the cracks had only been discovered after the floor of the vehicles was removed during the inspections.
“It’s pretty extensive,it’s pretty much across the fleet,” he said. “The trams we have inspected so far have all shown various degrees of cracking.”
Mr Collins said it was not yet known how long the trams would be sidelined for,with more than 50 buses replacing the light rail to service the network.
“They’ve got a lot of work to do,and they are literally looking at every tram now going through each one of them,stripping out the floors,” he said.
Mr Collins said most of the cracking had been discovered near what he described as the wheel-arch of the trams.
The trams that service the CBD light rail are at this stage not compatible with the Inner West line because they have a different wheel profile and are far longer.