The lack of theoretical analyses necessary for achieving high speed railroad trains and discussions about serious vibration problems including criticism from experts that "people would not be able to endure a high speed train for very long" was reaching a frightening level, and this problem had almost been made light of until a staff member, who had been studying aircraft flutter countermeasures at the former "Kaigun Koku Gijyutusho (later called Kaigun Kugisho) at the Japanese Naval Aeronautical Technology Institution, joined the General Railway Technology Institution after the World War.
鉄道車両の高速運転の実現に必要な理論解析、特に「高速になると、人間が長時間乗れるものではなくなっていた」と専門家に評された、機関車の深刻な振動問題への考察の欠如は恐るべきレベルに達しており、この問題は第二次世界大戦後、鉄道総合技術研究所へ旧海軍航空技術廠（空技廠）において航空機のフラッター対策を研究していたスタッフが加入するまで、ほとんど等閑に付され続けた。