The mudslide caused by heavy rain hit the railway tracks of Keikyu's main line between Oppama and Keikyu Taura stations, both in Yokosuka, around midnight Monday, leaving 32 people injured.
For a while, Keikyu trains are unlikely to run on time as they will move slowly near the scene of the accident, the official said.
Firefighters and Keikyu
employees rushed to rescue passengers on the train stuck around 500 meters north of Taura Station.
Another case of derailment occurred near the site in April 1997 when a Keikyu
train rammed into a landslip, injuring 19 people.
Keikyu conducted a survey on mudslide risks in April last year and found the derailment site to be relatively safe, the transport ministry said, adding that no restrictions had been placed on the area in the event of heavy rains.
On Tuesday, Keikyu, one of the major private railway operators in the Tokyo area, suspended train services on the line between Kanazawa-Hakkei Station, which is next to Oppama Station, and Hemi Station.
which operates Keikyu
bus services, said it will start a bus link between Tokyo's Haneda airport and Tokyo Sky Tree when the world's tallest self-standing tower opens to the public on May 22.