East Japan Railway Co. said Monday it will spend at least 50 billion yen to 60 billion yen during four years from fiscal 2005 on antiquake measures such as reinforcing elevated lines.

The move was prompted by a series of heavy earthquakes that hit Niigata Prefecture and derailed a bullet train in October.

Roughly 25 billion yen was spent between fiscal 1995 and 2003, JR East officials said.