East Japan Railway Co. resumed all Tohoku Shinkansen services on the line connecting Tokyo and Aomori on Thursday for the first time since a powerful earthquake hit the country's northeast and derailed a bullet train on the line nearly a month ago.

The high-speed trains are now back in service between Fukushima and Sendai stations, the only stretch of the line on which operations had still been suspended. The resumption also enabled trains operating on the Hokkaido and Akita shinkansen lines to reach Tokyo.

However, the company, also known as JR East, said that efforts to restore infrastructure are still underway and that its bullet trains will operate at a reduced speed and on temporary timetables for the time being.