Police are yet to determine the "exact cause" of a collision between a truck and a Victorian passenger train in which 19 people were injured.
Ninety-nine people were aboard the Warrnambool bound V/Line train when it derailed following the smash at a level-crossing in Pirron Yallock yesterday afternoon.
The truck driver, a 41-year-old man from Ballarat, was airlifted to Royal Melbourne Hospital in a critical condition.
A hospital spokesperson said today he had improved overnight and his condition was now serious, but not critical.
Eighteen people, including a train conductor, were taken to hospitals around the area suffering cuts, bruises and broken bones.
One of the passengers, Julia Thompson, told the Warrnambool Standard she was flung off her seat during the collision.
"It felt like an earthquake. Everything was shaking and rocking," Ms Thompson said.
Police will return to the scene of the crash near Colac today to continue their investigation.
They say "the exact cause of the incident is yet to be determined".
The railway line will remain suspended and buses will replace trains on the line until further notice.
The level crossing is categorised as a "passive crossing" with no boom gates or flashing lights.
