Roger Blanch, 55, is believed to have died instantly on being hit by a crane’s pole-driving equipment, which came loose when the crane was crushed by a cement pylon.
His son, the crane operator, was still fighting for his life in Cairns Base Hospital last night.
A Queensland Health spokesman said his condition, which was critical on Friday night, remained serious but stable yesterday.
The pair was working on a railway bridge upgrade on the banks of the Tully River about 100km south of Cairns at the tiny town of Euramo, near Tully.
Mr Blanch is believed to have been directing his 23-year-old son, standing metres from the crane, when the accident happened about 7.15am.
He and his son had been contracted by Brisbane company Seymour White for the Queensland Rail project and they are believed to have been living in the Tully region for only a brief time.
Work has been suspended at the site since the accident.
A Queensland Rail spokesperson said Workplace, Health and Safety was continuing its investigations, which began on Friday when three officers visited the scene of the fatality.