The government has decided to ask Japan Railway to draw up plans to relocate bullet trains to safer areas if flooding is expected.
That's after Typhoon Hagibis hit central Japan in October and flooded a Shinkansen bullet train depot, leaving damaged trains that had to be scrapped.
The Transport ministry made the decision after officials conducted a survey and found that out of 28 bullet train depots, 16 are in areas susceptible to floods.
The ministry also wants JR to step up its disaster preparations.
This includes having contingencies for suspending operations and plans to protect power supply systems from flooding.
The ministry is also looking into the flood risks for local JR trains and for private railway services.
It wants to see if they should also undertake the new anti-flood measures.