However, in addition, the mainstream engineering staff including Kiich ASAKURA and Hideo SHIMA, who played leading roles in designing motor vehicles from the 1920s to the1930s, were extremely afraid of taking risks on a fundamental technical level and stuck fast to German technology, in particular to a rather old-fashioned Prussian approach of driving slow, large-diameter drive wheels.
だがそれに加えて、鉄道省で1920年代から1930年代にかけて動力車設計を主導した朝倉希一や島秀雄ら主流派技術陣は、根本的な技術面での冒険を過度に恐れ、ドイツ系の技術、それも大径動輪をゆっくり駆動する、プロイセン流のやや旧式化した手法に専ら固執し続けた。