A coroner believes the investigation into last week's Dreamworld tragedy could take months but he is hopeful of holding an inquest next year.
Coroner James McDougall joined investigating detectives at the Gold Coast theme park on Tuesday as police held a re-enactment of the accident which killed four people.
Weighted crash-test dummies were delivered to the scene on Monday to simulate the people in a raft on the Thunder River Rapids ride last Tuesday when it flipped following a suspected malfunction.
Cindy Low, Kate Goodchild, her brother Luke Dorsett and his partner Roozbeh Araghi died in the accident.
Ms Low's 10-year-old son Kieran and Ms Goodchild's 12-year-old daughter Ebony both survived the tragedy.
Mr McDougall said Tuesday's re-enactment gave him a good insight into the accident and the inquest will probably be held next year.
"The investigation is going extremely well," he said.
"It's a very significant investigation -- four people lost their lives.
"It will take a long time ... months I'd say."
The bodies of those killed were released to their families on Monday following post-mortem examinations.
The park itself remains closed, with park bosses saying it will not reopen until at least after the funerals.
About 200 Dreamworld staff returned to work on Monday.
Dreamworld chief executive Craig Davidson has said all staff will be paid while the park remains closed.
A handful of Red Cross volunteers remain at the park's entrance, protecting the hundreds of flowers, soft toys and other tributes laid there over the past week by mourners.
The floral tributes will be incorporated into a permanent memorial within the park, Mr Davidson said on Saturday.
Queensland Premier Anastasia Palaszczuk said last week's tragedy would remain in people's minds for a long time.
"I want to ensure that everything that can be done will be done to assist those people and those families who witnessed this horrific event," Ms Palaszczuk told parliament.
