HUALIEN, Taiwan (REUTERS, AFP) - The manager of a construction site whose truck slid onto rail tracks causing a catastrophic train crash in Taiwan accepted responsibility for the disaster on Sunday (April 4), as did the transport minister, although his offer to resign was rejected for now.

In the island's worst rail accident in seven decades, 50 people have been confirmed dead after a packed express train carrying almost 500 passengers and crew slammed into a truck near the eastern city of Hualien on Friday, causing it to derail and the front part to crumple.

The truck that the train hit had slid down a sloping road onto the track just outside a tunnel. Officials are investigating the manager of the construction site, Lee Yi-hsiang, whose truck is suspected of not having its brakes properly applied.

Lee had been released on bail, though the high court's Hualien branch on Sunday rescinded that decision after the prosecutors appealed it, sending the case back to the lower court.

Lee read out a statement apologising for what happened as police took him away from his residence, Taiwan media reported.

"I deeply regret this and express my deepest apologies," he said. "I will definitely cooperate with the prosecutors and police in the investigation, accept the responsibility that should be borne, and never shirk it. Finally, I once again express my sincerest apologies."

Lee, 49, was part of a team who regularly inspected Taiwan's mountainous eastern train line for landslides and other risks. He was questioned over the weekend by prosecutors.

Speaking earlier in the day at the crash site overlooking the ocean and backed by precipitous mountains, Transport Minister Lin Chia-lung said he too would "not avoid" responsibility.

"I am also in charge of minimising the damage caused by the entire accident. After the whole rescue work is completed, I believe I will take the responsibility," he said.

Premier Su Tseng-chang's office said Mr Lin had made a verbal offer to resign on Saturday, but Mr Su rejected it for the time being, saying efforts for now should focus on rescue and recovery.

Workers are continuing to remove the train from inside the tunnel and look for other bodies, and officials have warned the death toll could go up or down as they verify identities. The government revised the toll down by one on Sunday evening to 50.

The Transport Ministry and the rail administration that comes under it are facing a number of questions, including why there was no proper fencing at the site and whether too many standing-only tickets were sold for the train journey.

Deputy transport minister Wang Kwo-tsai said late on Saturday the railway administration needed to take hard look at all these issues.

The railway administration is also without a permanent director after its former chief retired in January. The position is being filled in an acting capacity by another deputy transport minister, Mr Chi Wen-chung.

Mr Wang said Mr Lin was working hard to find the right person to fill the job.

Survivors reported that the train driver was honking his horn shortly before the crash but did not - or was unable to - slow down before striking the truck.

The United Daily News newspaper ran a report on Sunday based on initial analysis from footage of the train recorder that showed the truck was on the line before the train went into the tunnel and no slowdown before impact.

The crash has plunged Taiwan into mourning. Some survivors lost entire families. A French national and two Americans were also confirmed killed.

The uncle of the youngest confirmed victim, a five-year-old girl, tearfully told reporters he was still waiting for an apology for the accident.

"I'm so angry," he said.

The government has promised compensation and said it will do everything it can to help survivors and their relatives, including coordinating public donations.

The damaged section of the track will not reopen until April 20 at the earliest, Mr Wang said, though rail traffic continues on a parallel track that runs through another tunnel and was not affected by the accident.

The accident occurred at the start of a long weekend for the traditional Tomb Sweeping Day, when people return home to tend to family graves.

Survivors have described terrible scenes inside the wreck.

Priest Sung Chih-chiang told Reuters what surviving passenger Chung Hui-mei had told him.

"She could not find her daughter. When she yelled, she found her daughter was under the steel panels. She put her effort to move those pieces one by one, but her daughter's voice became quieter and quieter, and then there was no response," he said.

Taiwan's eastern railway line, a popular tourist draw, winds its way through towering mountains and dramatic gorges before entering the picturesque Huadong Valley.

The last major train derailment in Taiwan was in 2018 and left 18 people dead on the same eastern line. Taiwan's most deadly rail disaster on record was in 1948 when a train caught fire and 64 people perished.