Tokyo Electric Power Co. (TEPCO) has announced there will be no 
blackouts today (March 27 Sunday).  Like yesterday, trains will
run today along stripped-down schedules on most lines.

JR East has announced limited suspension on only the Kururi Line in 
southern Chiba.  Part of the Sagami Line, part of the Ryoumou Line,
Joban Line beyond Tsuchiura and Tohoku Line beyond Kuroiso are still closed.

Other major operators say that no sections will be closed.

All sections of the JR Central Gotemba Line as well as the Minobu Line 
will be in operation today.

Details here:
http://www46.atwiki.jp/earthquakeinfo_en/pages/15.html

Note that TEPCO has subdivided the blackout groups.

http://www.tepco.co.jp/index-j.html (Japanese)
http://www.tepco.co.jp/en/press/corp-com/release/betu11_e/images/110325e12.pdf 
(Schedule, English)