.. Quotes - .. "Engine bay fire suppression systems (EBFS) were fitted to all NSW public transport buses by September 2017, ... 63 of the 90 buses that caught fire or overheated in 2017 had an EBFS system fitted." .. "Fire suppression systems were effective in several fires, including one that started in the engine bay of a gas-powered bus, with all passengers evacuated safely." .. [However, .. a] " fire flashed over into the passenger saloon and the damage was such that the bus was considered unrepairable," the report said. .. Remarkably, .. "Another fire that started in the engine bay of a gas-powered bus was put out by the fire suppression system, despite the driver not shutting off the gas supply." .. "Another fire that was reported started in the engine bay of a bus as it was returning to the depot after having the EBFS system fitted. There were no passengers on-board and the suppression system activated, but the fire reignited after the bus arrived at the depot." Source - https://www.smh.com.au/national/nsw/heat-grows-on-nsw-bus-network-20180311-p4z3td.html Conclusion - While not absolutely successful, far BETTER THAN up to 63 extra Burned-Out buses.