A strong earthquake shook east Japan near midnight last night.

JR trains around Sendai will not operate today.  JR lines in Miyagi and 
most of Yamagata and Fukushima are closed for the day.  JR lines in 
Aomori, Akita and Morioka will be closed until noon.

Railways in the Tokyo area are running along their modified timetables 
with no major disruptions.

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Keio has re-modified its timetable today.  The company says the number 
of trains was insufficient to carry workday loads.  The new timetable is 
close to the ordinary one.

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Odakyu has announced that Romance Car services will partially resume 
April 16.  All runs will start/terminate at Shinjuku.  There will be no 
"Subway Romance Car" services for a while.  There will be two daily 
Asagiri trains to Numazu by JR Central Gotemba Line.

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For details see:

Trains and long-distance buses in Tohoku area:
http://www46.atwiki.jp/earthquakeinfo_en/pages/15.html

Trains in Tokyo area:
http://www46.atwiki.jp/earthquakeinfo_en/pages/40.html

New Keio Timetable:
http://www46.atwiki.jp/earthquakeinfo_en/pages/40.html#id_dbdbfc4d