Queensland Rail will tonight test the brakes on a passenger train similar to the one that crashed on Brisbane's bayside almost a fortnight ago.
More than a dozen people suffered minor injuries when the train failed to stop at Cleveland Station and smashed into a toilet block.
Rail, Tram and Bus Union (RTBU) spokesman Owen Doogan says QR executives agreed to the move at a meeting last night.
Mr Doogan says he is convinced the brakes failed on the Cleveland train and is hoping the test will provide some answers.
"We don't know the quality of the exercise because I'm not the engineer," he said.
"We'll really have to see exactly what's been done and then make a decision on whether or not it's what's required and also we'll see what the results are too.
"This will be out on a live track - operational means an operation.
"The train will be working in defined areas and there will be particular steps taken to attempt to test the brakes in a number of circumstances."
The Australian Transport Safety Bureau (ATSB) will release its preliminary report into the crash in about a fortnight.
The ATSB says it has interviewed a number of crash witnesses including the driver, guard and passengers and is analysing the train's data loggers.