The Rail, Tram and Bus Union says it will continue its campaign to have a model of train removed from service, after a crash on Brisbane's bayside last week.
About 12 people suffered minor injuries when a passenger train crashed into Cleveland Station on Thursday.
Fair Work Australia ruled on the weekend there was no evidence to support the union's claim of brake problems and ordered union members to keep driving that type of train.
Queensland Transport Minister Scott Emerson urged the union to allow investigators to pinpoint the cause of last week's crash.
But union secretary Owen Doogan says it will appeal against Fair Work Australia's decision because it is concerned about the train's safety.
"Can you imagine what could've happened if that was a crowded platform?" he said.
"There was no doubt that the driver did everything he possibly could to stop the train.
"If the driver is not responsible then there is only one other possible responsibility, and that's the equipment - in this case it's the train.
"The driver's brakes didn't work.
"If we had a similar situation with aeroplanes they would be grounded.
"There are just as many passengers, if not more passengers ... travelling on trains."
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