Japan's transport ministry said it will check Shinkansen bullet train depots across the country for flood risk.
The move comes after East Japan Railway Company's depot in Nagano City was flooded last weekend when Typhoon Hagibis caused the Chikuma River to overflow.
One-third of the train carriages on the Hokuriku Shinkansen line were damaged in the floods.
Japan Railway companies have 18 train depots and bases across the country for bullet trains. Some of them are in areas thought to be susceptible to flooding.
Ministry officials also plans to include local JR lines and private railway companies in the survey. The ministry will announce countermeasures once the investigation is complete.