Services on the newly opened Fukutoshin (Subcenter) Subway Line in downtown Tokyo have been disrupted for four consecutive days since its inauguration on Saturday due to technical problems and errors, its operator said.

"A series of problems were caused by workers' inexperience. We'll assign experienced workers to help out in an effort to ensure punctual operations," said a spokesman for the line's operator, Tokyo Metro Co.

At around 7:30 a.m. on Tuesday, circuit breakers at Wako and Asaka power substations in Saitama Prefecture were tripped, forcing trains to stop for 30 seconds, according to Tokyo Metro officials.

The trouble delayed trains on the Fukutoshin Line as well as the Yurakucho Line and Tobu Railway Tojo Line, which operate through trains with the trouble-plagued new line, by up to 30 minutes.

A Tokyo Metro official said such trouble could occur on any line. "Multiple trains happen to simultaneously speed up, causing an overload. Trouble like this could occur on any electric railway line."

On the weekend, services on the line were delayed by up to 33 minutes because of trouble involving the automatic train operation system and other technical problems. On Monday, a railway switch was erroneously set near Higashi-Shinjuku Station, forcing a local train to pass the station it was supported to stop at.

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