MADRID: Spain's transport minister handed in his resignation on Tuesday (Nov 3) following a train crash that killed 69 people last week, one of the worst railway disasters in Europe this century.

Oscar Puente, who had earlier pledged to work "tirelessly" to restore confidence in the world's second-largest high-speed rail network, also said he was withdrawing from the country's upcoming general election.

Last week's crash, along with another disaster earlier this year, have overshadowed campaigning for the November 29 ballot, in which Socialist Prime Minister Pedro Sanchez is trailing in opinion polls.

Puente had ruled out resigning on several occasions since the accident.

But at the end of a lengthy hearing before lawmakers, he said: "I wish to inform you that I am not only stepping down from my position as Minister of Transport, but that I am also withdrawing my name from the lists for the early legislative elections on November 29."

Hours earlier, at a press conference during which he presented measures to improve safety, the minister had said the government would "work tirelessly to achieve and regain the public's trust in high-speed rail".

The right-wing opposition, which had demanded Puente's resignation, and unions have criticised him for appearing to pin all the blame for the disaster on one control centre operator.

The accident happened when a train operated by the state-owned Renfe ploughed into the back of a stationary train belonging to the private Spanish company Iryo on Wednesday outside the village of Urda, around 130 kilometres (80 miles) south of Madrid.

The failure of an automatic safety system halted all trains on a 63-kilometre stretch of track, but a control centre nonetheless authorised the Renfe service to resume its journey.

Among the measures announced at the earlier press conference by Puente was the creation of software for control centres that would issue automatic alerts and make it easier to spot anomalies in traffic.

Puente said an AI agent would be created to oversee the system and "minimise the possibility of human error", describing the proposal as unprecedented.

In scenarios where a control centre operator took a decision while the automatic safety system was down, a second operator would have to confirm it, Puente added.