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But how to make self-driving trains handle any emergencies－for example, obstructions on the tracks－remains the most important problem yet to be solved, he said.

But rescuers now have to figure out how to get them out, through several kilometres of dangerously flooded tunnels, or even to attempt to bring them out for now.

But in about two years, Boston riders could soon enjoy more comfortable on state-of-the-art subway cars, which will have larger seats, LCD monitors, CCTV-operated display screens and automatic passenger counting systems.

But only about a third of the district's 492,000 affected students turned up on the first day of the work stoppage, many parents choosing to keep their children home. The Los Angeles Zoo, La Brea Tar Pits and museums have offered free admission to students during the strike.

But hitting that target had been accompanied by challenges, Yang Zhongyuan, vice-chairman of the urban construction and environmental protection committee of the Beijing Municipal People's Congress, said in a report delivered on Thursday to the Standing Committee of the Beijing Municipal People's Congress.