THE extensive and expensive measures taken to keep Perth bus passengers safe from potential injury in another dangerous fire have been revealed for the first time.
Late last year and early this year, three Mercedes OC500 gas buses, worth around $550,000 each, burst into flames - prompting bus drivers across the city to threaten to walk off the job unless answers were forthcoming.
The potential safety risks to drivers and passengers forced urgent action from the Public Transport Authority (PTA), although it stopped short of taking gas buses off the road because they represented about 40 per cent of the total fleet.
The authority's just-released annual report has revealed that Mercedes, local fire experts and engineers from Australia and overseas had all worked to come up with measures to stop the fires.
And the PTA has confirmed the works in its fleet of 475 Mercedes gas buses have now cost $1.4 million.
These included a significantly upgraded fire suppression system, different engine coolant, changes to coolant hoses, reworked insulation and the ability for drivers to isolate battery and gas controls.
The buses' exhaust system has been redesigned with extra heat shielding, and weekly inspections have also been ordered.
In August, the PTA confirmed it had taken legal action against the manufacturers of its gas bus fleet over the series of fires, with a writ claiming Mercedes failed to meet its design, longevity and safety requirements.
The writ has been lodged, but not yet served, with negotiations between the two ongoing.
"Mercedes Benz and the PTA are continuing to negotiate the terms on which a scope of works can be developed and implemented to carry out any further items identified as requiring rectification," the annual report said.
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