Rescuers pulled the final survivors from the gnarled wreckage of Japan’s worst train crash in decades today as investigators raided rail operator offices for clues about why the train skidded from the tracks, killing 73 people.

Power shovels picked at the piles of twisted railway cars and debris, peeling away layers of crushed metal to allow better access to the two train cars flattened against an apartment building the train slammed into during yesterday’s deadly accident in Amagasaki.

Agents swarmed eight offices of West Japan Railway Company, carting away cardboard boxes of documents. The probe into possible professional negligence has focused on the actions of the 23-year-old driver – who has not yet been accounted for – and the speed of the train.

Workers freed two survivors from the wreckage early today, and police said they did not expect to find anyone else alive. Hiroki Hayashi, 19, was sprung from a damaged car after surviving the night with the help of an intravenous drip and drinking water.

“I’m in pain, I can’t take it anymore,” he told his mother in a mobile phone call after the crash, according to his 18-year-old brother Takamichi Hayashi.

Hiroki Hayashi was injured in the leg and was conscious and in stable condition at a hospital.

Victims’ relatives struggled to comprehend their loss.

“I wish it were only a nightmare,” Hiroko Kuki, whose son Tetsuji was killed in the crash, told public broadcaster NHK. “I only saw him the night before … I wish he were alive somewhere.”

In northern Japan, the lead car of a passenger train jumped the tracks when it crashed into a trailer at a crossing at Nimori today in the second derailment in two days. The trailer’s driver was slightly hurt.

The seven-car train that crashed yesterday in Amagasaki was packed with 580 passengers when it jumped the tracks near the Osaka suburb and plunged into the first floor of an apartment complex.

More than 440 people were injured.

Government inspectors launched their accident investigation today by examining tracks. They also planned to recover a recorder with data on the train’s speed and other details at the time of the accident, said Shimoda, a Transportation Ministry inspector who gave only his family name.

Yesterday’s accident occurred at a curve after a straight. Passengers speculated the driver may have been speeding to make up for lost time after overshooting the previous station.

The train was nearly two minutes behind schedule, company officials said.

The driver – identified as Ryujiro Takami – had obtained his train operator’s license in May 2004.

One month later, he overran a station and was issued a warning for his mistake, railway officials and police said.

They were investigaing the case as possible professional negligence by the train operator, West Japan Railway, a prefectural police spokesman said.

Tsunemi Murakami, the safety director, said he instructed company employees to “fully co-operate” with police investigation to look into the cause of the accident.

“We take it seriously because of a large accident like this,” Murakami said.

Deadly train accidents are rare in Japan. Yesterday’s accident was the worst rail disaster in nearly 42 years in safety-conscious Japan, which is home to one of the world’s most complex, efficient and heavily-travelled rail networks.

A three-train crash in November 1963 killed 161 people in Tsurumi, outside Tokyo.

Five people were killed and 33 were injured in March 2000, when a Tokyo underground train hit a derailed train. An accident killed 42 people in April 1991 in Shigaraki, western Japan.

An earthquake in 2004 caused a bullet train to derail – the first since the high-speed trains went into service 40 years ago.

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