The twisted debris and the distressing screams may be 37-years gone but for many impacted by Australia's worst train disaster, the memories remain vivid.
Eighty-three people were killed when a city-bound commuter train derailed in Granville in Sydney's west on January 18, 1977.
The train took out the base of the Bold Street overpass causing the massive structure to crush two passenger carriages.
Emergency service workers who helped pull the injured and lifeless out of the wreckage, along with survivors and families will gather in Granville on Saturday for the disaster's 37th anniversary.
Gerard Buchtmann responded to the "bloody mess" as captain of the Nepean rescue squad.
"It was absolutely horrific the scene that confronted us when we pulled up," he told AAP.
"When you get out of the truck to a scene like that, the first thing you do is say a little prayer."
Mr Buchtmann, who now works with the Granville Memorial Trust, said the anniversaries provided a forum for those impacted by the disaster to talk.
"A lot of the families that have lost people just like to have a talk to us and that helps them and us as well," he said.
The "day of the roses" ceremony will see 83 roses handed out in memory of the victims.
Members of parliament and local councillors are also expected to attend.
The ceremony will start at 11am (AEDT) at Granville Memorial Gardens on Carlton St.