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	Assoc Prof Ratchaphon Suntivarakorn, who leads the Khon Kaen University&rsquo;s mechanical engineering department, examined the vehicles involved in the accident and found that the accelerator pedal had been rusted.&nbsp;</div>
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	&ldquo;There are grounds to believe that the rust caused the accelerator to fail,&rdquo; he said.&nbsp;</div>
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	The crash took place on Sunday, killing five people and injuring 55 others.&nbsp;</div>
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	Police called on Ratchaphon to help with the investigation, because he is an expert in mechanical engineering. He examined the vehicle in police presence.&nbsp;</div>

Trolleybus crash blamed on rusted accelerator

A rusting accelerator has been identified as the likely cause of the fatal crash of two trolleybuses at the Khon Kaen Zoo.